66 



MISC. PUBLICATION 631, U. S. DEPT. OF AGRICULTURE 



of the body openings in man can be found in the literature, but un- 

 doubtedly many of these refer to G. americana. C. maeellaria is pri- 

 marily a scavenger and may be very abundant in carrion. In myiasis 

 cases in animals it is a secondary invader ; its larvae do not form the 

 typical pocketlike injury characteristic of C. americana but often 

 migrate into the wool or hair around the wound. In cases of severe 

 infestation, however, it may produce the death of the animal. 



Literature. — For the taxonomy see Hall (]$) ; for the biology and 

 immature stages see Hall (49) and Laake, Cushing, and Parish (77). 



The Genus PARALUCILIA Brauer and Bergenstamm 



This genus may readily be distinguished by the characters given in 

 the key. 



PARALUCILIA WHEELERI (Hough) 



Synonym. — Compsomyiops wheeleri (Hough). 



Recognition Characters. — The large size (9^11 mm.) and the dark-brown 

 squamae will readily distinguish this species from the only other member of the 



Figure 27. — Paralucilia wheeleri, head of female, front view. 



genus known to occur in North America (P. fulvipes (Macquart) ), as well as from 

 species of Callitroga, with which it has sometimes been confused. For a com- 

 parison of the head of the female with that of C. americana and C. maeellaria, 

 see figures 23, 24, and 27. 



Geographical Distribution. — Nearctic Region : Texas, Colorado, New Mexico, 

 Arizona, Washington, California. Neotropical Region: Mexico (to the southern 

 part). 



Pathogenesis. — This species has been recorded in wound myiasis, 

 usually in association with larvae of other myiasis-producing genera. 

 It is probably of little importance. 



The Genus CHRYSOMYA Robineau-Desvoidy 



(including Microcalliphora) 



The name of this genus is usually written Chrysomyia, but the in- 

 sertion of the S" is an unwarranted emendation. As treated here, the 

 genus is undoubtedly a composite. Microcalliphora is most probably 

 valid, and the same may be true of other segregates, such as 

 Achoetandrus. Further taxonomic study is needed before the status 



