Key to the species of Chrysomya in the West Indies 1. Lappets of anterior thoracic spiracle brown to dark brown; genal dilation with orange vestiture and setae; male eye with upper facets much enlarged and with sharp demarcation from small facets below (Fig. 19) ....... C. megacephala - Lappets of anterior thoracic spiracle pale; genal dilation with pale vestiture and white setae; eye facets of male with no clear line of demarcation between larger and smaller facets ................................................................................... 2 2. Proepisternal seta absent ............................................................................................................................... C. albiceps - Strong proepisternal seta present (Fig. 20) ................................................................................................................... 3 3. Notum mostly shining, little or no tomentum when viewed from rear; male frons width twice the width of anterior ocellus; male outer vertical seta usually present; female with posterior margin of T5 with cleft (Whitworth 2006, as in fig. 49) ..................................................................................................................................................... C. rufifacies - Notum with more whitish tomentum, especially along edge of mesonotum; male frons width less than the width of anterior ocellus; male outer vertical seta usually absent; female with rear edge of T5 without a cleft; not currently known in West Indies, but found in South and Central America .................................................................... C. putoria

Published as part of Whitworth, Terry, 2010, Keys to the genera and species of blow flies (Diptera: Calliphoridae) of the West Indies and description of a new species of Lucilia Robineau-Desvoidy, pp. 1-35 in Zootaxa 2663 on page 11, DOI: 10.5281/zenodo.276279