646 townsend: new generic name for screw-worm fly 



paper not only to demonstrate this fact, but also to supply the 

 deficiency. 



Cochliomyia Townsend, gen. nov. 



Genotype, Musca macellaria Fabricius, Syst. Ent. 776. 1775. 



Differs from Chrysomya R.D. by the epistoma being well elongate, 

 well narrowed b> the vibrissal angles, and its plane normally nearly or 

 quite in the vertical. The vibrissae are well removed from the oral 

 margin, normally by a distance equal to twice the length of the second 

 antennal joint. The third vein may be either almost bare or distinctly 

 bristled more than half way to the small crossvein. The parafacials 

 are pubescent. The hind scale of tegulae is not hairy on posterior half, 

 but bare. Antennae not separated at base. The epistomal characters 

 are almost a duplication of those of Pollenia. 



The generic name has reference to the popular name of the maggot — 

 Screw-worm. 



The genera Pollenia and Cochliomyia stand removed from all the 

 other Muscidae (syn. Cp,lliphoridae) on the epistomal characters in- 

 cluding the constricted facial plate. Other forms having the vibrissae 

 far removed from the oral margin, as Thelychaeta B. B. (East Indies) 

 and Apollenia Bezzi (Africa), do not have the facial plate strongly 

 constricted, and further differ in having the antennae separated at base. 

 Chryso77iya R.D. has the plane of epistoma at an angle of about 45** 

 to the vertical, and while the facial plate may be somewhat constricted 

 the epistoma is neither so narrowed nor so elongate as in the present 

 genus; it also has the hind scale of tegulae hairy on posterior half, and 

 the parafacials are practically bare. 



The extensive synonymy that has been given by E. Lynch-Arri- 

 balzaga for macellaria, and quoted by others,^^ cannot be accepted 

 without very careful verification in each case. Certain of the species 

 described are undoubtedly valid. Some of them belong to Paralucilia 

 and not to Cochliomyia. Chrysomya wheeleri Hough, of California, 

 belongs to Cochlioynyia. The writer has collected a species of Cochlio- 

 myia in the Andes of Peru which is abundantly distinct from macellaria 

 and which occurs at an altitude of over 12,000 feet. He has also taken 

 specimens in Peru that are evidently to be referred to Paralucilia, and 

 has seen others from Brazil that belong to the same genus, all closely 

 resembling macellaria in the vittate thorax and other superficial char- 

 acters. Thus it can be seen that much confusion has resulted from the 

 attempts to lump all the names in question. 



i^Williston, Proc. U. S. Nat. Mus. 12: 203. 1889. Giglio-Tos, Ditt. Mess. 

 IV (Mem. R. Ace. Sc. Torino, ser. 2, 45), 5-6. 1895. Aldrich, Cat. No. Am. 

 Dipt. 517. 1905. 



