SuBFAMILY CHRYSOMYINAE 103 
TRIBE CHRYSOMYINI 
(The screwworm flies) 
The species placed in this tribe (color plate I) have fine pile 
posteriorly on the hind coxae, and have but one presupraalar 
bristle on the thorax. None of the larvae of these species has a 
well-defined ‘‘button’’ in the posterior spiracle. 
The names Chrysomya Robineau-Desvoidy, Mya Rondani, 
Somomya Rondani, Compsomyia Rondani, and Pycnosoma 
Brauer and Bergenstamm have been used in the taxonomic and 
economic literature of North America. It is therefore considered 
necessary to review a part of the taxonomic history of Chry- 
somya and other names that have been confused with it in this 
country, for the genus Chrysomya does not occur in the Western 
Hemisphere. 
Robineau-Desvoidy (1830, p. 444) proposed the generic name 
Chrysomya without designating a genotype. Rondani (1863, p. 
27) included Musca marginalis Wiedemann (1830) in Chry- 
somya and designated it as genotype. Bezzi (1907, p. 544) stated 
that Chrysomya regalis Robineau-Desvoidy, an originally in- 
eluded species, was a synonym of Musca marginalis Wiedemann. 
Coquillett (1910, p. 523) accepted (marginals) =regalis as geno- 
type of Chrysomya. Townsend (1916, p. 6) drew the same con- 
clusion. 
Rondani (1850, p. 175) proposed the generic name of Mya for 
a group of similar species, but this name was preoccupied. In 
1856 (p. 90) he proposed (Musca vomitoria Fabricius) = vomi- 
toria Linnaeus as the genotype; Mya is thus an isogenotypic 
synonym of Calliphora Robineau-Desvoidy. Coquillett (1910, 
p. 571) designated Musca segmentaria Fabricius as genotype for . 
Mya, but this designation cannot be considered valid because of 
the prior selection of vonutoria by Rondani. 
Rondani (1861, p. 9) proposed the name of Somomya for the 
segregate which he had previously described under the name of 
Mya. In 1910 (p. 606) Coquillett erroneously designated Musca 
segmentaria Fabricius as genotype of Somomya, but Somomya is 
an isogenotypic synonym of Calliphora; its genotype is Musca 
vomitoria Linnaeus. 
Rondani (1875, p. 425) proposed the generic name Compso- 
mya for several European and Asiatic species, without designat- 
ing a genotype. Brauer and Bergenstamm (1894, p. 12) select- 
ed Musca macellaria Fabricius as genotype for Compsomyia, but 
Villeneuve (1914, p. 256) and Townsend (1915, p. 646) showed 
that this species is unavailable as genotype and the latter author 
