154 



ENTOMOLOGY FOR MEDICAL OFFICERS 



course and duration of development is much the same as 

 that of the house-fly. 



riG. 64.—" Pupa " of Blow-fly. 



Genus Lucilia. The species, which are widely distributed, 

 resemble those of Calliphora in form and habits, but are of 

 a brilliant metallic green or bluish-green colour, and have 

 much less hairy cheeks. The eggs and maggots much 

 resemble those of Calliphora and are deposited in similar 

 places, and the course of development is the same. 



Genus Pycnosoma (ttukvos = thick ; aa>iJ.a = body). The 

 species are found in Tropical Africa and Tropical Asia. They 

 resemble those of Lucilia, but usually have a rather stouter 

 body, are of a more coppery tinge and have the hinder edge 

 of some of the abdominal segments black, giving the abdomen 

 a cross-banded appearance. The maggots of a species of 

 Pycnosoma have actually been known to get into the nostrils 

 of living people and to burrow into the contiguous sinuses, 

 causing great pain ; but ordinarily the habits and develop- 

 ment are like those of Calliphora. 



Genus Chrysomyia (xpva-o^ = gold ; fivca = fly). The species 

 are restricted to America and are distinguished from those 

 of Lucilia by the dark longitudinal stripes on the scutum. 

 Chrysomyia macellaria, Fabr., is the well-known Screw-worm- 

 fly which is a common cause of myiasis in Tropical America, 

 the maggots having been found in wounds, in the nasal 

 passages, and even in the urethra. The maggots have a 

 general resemblance to those of Calliphora (Fig. 53), but the 

 constrictions between the segments are more strongly marked 

 and the bands of spines are more salient, the spines them- 

 selves being much coarser. The maggots, of course, like 

 those of Calliphora, etc., are usually found in putrid animal 

 matter. 



Genns , Auchvieromyia (ai)xM';/oo'y = sunburnt, or dirty; 



