Key to the species of the crassipes species group Distribution is included in the key only when it aids in species identification, and is not included for all species. 1 Body size small, males usually 12–13 mm, females 13–14 mm (Tab. 2). Western U.S., Northern Mexico or the Baja peninsula.................................................................................................... 2 - Body size larger, males usually more than 13 mm, females more than 14 mm (Tab. 2); if male 13 mm or female 14 mm, never found in the Western United States, Northern Mexico or the Baja peninsula....................................... 3 2 Pronotum dark red, fore tibia uniformly dark red, corium dark red (Fig. 1G). Restricted to Baja California Sur, Mexico............................................................... Apiomerus peninsularis Berniker & Szerlip, sp. nov. - Pronotum black or orange-red, fore tibia banded with black and orange, corium orange to dark red (Figs 1B, 16B). Western U.S., Baja peninsula and northwestern Mexico........................ Apiomerus cazieri Berniker & Szerlip, sp. nov. 3 Black, posterior pronotal margin and connexivum orange to dark red (Fig. 1D) ………..... Apiomerus crassipes (Fabricius) - Variously colored, but not matching above pattern........................................................... 4 4 Males with dorsolateral lobes of the endosoma not divided into anterior and posterior portions, rather present as a single, folded sclerite with a lateral prolongation (Fig. 8A). Males and females with pronotum mostly black, sometimes with red at anterior or lateral edges, corium red, abdominal connexiva forming a continuous pale yellow to white margin around abdomen (Figs 1A, 16A). California (USA) and Baja California (Mexico)..... Apiomerus californicus Berniker & Szerlip, sp. nov . - Males with dorsolateral lobes of the endosoma clearly divided into proximal and distal portions (Figs 8B, 8C). Male and female color not as above, if similar in color, never found in California (USA) or Baja California (Mexico).............. 5 5 Proximal and distal portions of the dorsolateral lobes of the endosoma equal in size and shape (Fig. 8C). Females with distal margin of syntergite 9/10 flat (Figs 11H, 11J)............................................................... 6 - Proximal and distal portions of the dorsolateral lobes of the endosoma not equal in size and shape, proximal portion semicircular or tongue shaped, distal portion elongate (Fig. 8B). Females with distal margin of syntergite 9/10 emarginate or slightly emarginate (Figs 11C, 11E, 11F, 11I)...................................................................... 7 6 Pronotum mostly black, sometimes with red at anterior or lateral edges, corium and legs dark red (Fig. 1H).......................................................................................... Apiomerus rufipennis (Fallou) - Pronotal lobes orange or red, each with transverse black band along posterior margin, corium and leg color orange or red (Fig. 1J)..................................................... Apiomerus wygodzinskyi Berniker & Szerlip, sp. nov. 7 Median process of pygophore a broad, deep U-shape (Fig. 2C), abdominal venter usually black..................................................................... Apiomerus cooremani Costa Lima, Campos Seabra and Hathaway - Median process of pygophore a narrow U-shape (Figs 2E, 2F, 2I), abdominal venter usually striped.................... 8 8 Fore femur and tibia uniformly black, each abdominal connexival segment with a pale yellow to white stripe at anterior edge of segment, resulting in a banded appearance in dorsal and lateral view (Figs 1F, 17A)............................................................................................ Apiomerus montanus Berniker & Szerlip, sp. nov. - Fore femur and tibia red to brown, sometimes with apical half of tibia black, but never uniformly black, abdominal connexivum forming a continuous margin around abdomen (Figs 1F, 1I, 16D, 17B)....................................... 9 9 Males 12.5–14.2 mm, females 13.9–16.2 mm (Tab. 2), fore and mid legs red with apical half of tibia black. Florida peninsula and Florida keys (Fig. 1E, 16D)................................ Apiomerus floridensis Berniker & Szerlip, sp. nov . - Males 14.1–16.5 mm, females 14.2–17.3 mm (Tab. 2), legs red to brown, not always in above pattern. North Dakota south into Mexico, Arizona east through Texas and along Gulf Coast, never in the Florida peninsula (Fig. 1I, 17B)................................................................................................ Apiomerus spissipes (Say)

Published as part of Berniker, Lily, Szerlip, Sigurd, Forero, Dimitri & Weirauch, Christiane, 2011, 2949, pp. 1-113 in Zootaxa 2949 on pages 13-14