Vol. XXI] ENTOMOLOGICAL NEWS. 223 



ginatum, of which he identified thirty specimens from Texas, 

 Arizona, Montana and California. The specimens showed 

 great variation ; nine from Montana might be distinct, of smal- 

 ler size; one variety, Icntum, he designates by a name. A single 

 additional specimen from the Isthmus of Tehuantepec, he be- 

 lieved to be distinct and named it C. limbipennis. In (f) he 

 identifies additional specimens of marginatum from Central 

 America, and of both sexes of liinbipennis from three Mexican 

 localities. Later in (g) he records the rearing of marginatum 

 from larvae boring in the tissues of Opuntia, a common cac- 

 tus of the arid regions. 



From this summary of Williston's work on the genus it will 

 be seen that he examined large numbers of specimens, proba- 

 bly as many as sixty, and could make out but two species. 



Giglio-Tos, the Italian entomologist, who worked for some 

 years on Mexican Diptera, described two new species in (h). 

 which he called simile and parrum ; later in the same year (i) 

 he reprinted these descriptions and separated a third species,- 

 distinctum, from marginatum on account of the smaller size ot 

 the latter Cwith other slight differences) ; he redescribes mar- 

 ginatum, and figures both it and distinctum. All four of his 

 species were collected at Tehuacan, Mexico, and simile also at 

 Meztillan. He had 7 marginatum, n distinctum, 2 simile, i 

 parvum. 



In (j) Mr. C. H. Tyler Townsend reported on a lot of Dip- 

 tera from Lower California, among which he identified a num- 

 ber of species of I'&IuceUa, mostly new, but mentioned no spe- 

 cies of Copestylum. His type material was deposited in the col- 

 lection of the California Academy of Sciences at San Francisco, 

 where I made a careful examination of it only a few weeks 

 before it was entirely destroyed by the freat fire. To my sur- 

 prise, I found that his Volncclla cstcbana. lucasana, sodomis 

 and tolteea were all Copestylums. The specimens of toltcca 

 were not the types, and in looking up the original description 

 in another paper (k'K T found another series of species, fa.r. 

 inops and tolteea, so connected together in the descriptions a^ 

 to leave scarcely a doubt that they are all Copestylnms- The 



