128 INSEJCUTOR INSCITI^ MENSTRUUS 



squamula and front half of squama are white rather than yel- 

 low. Agrees with description in having abdomen wholly fer- 

 ruginous or rufous, with no black on median line or tip. Say's 

 description applies so closely that I feel practically no doubt 

 in the identification. But in order to avoid all future doubt as 

 to the identity of the present genus, the species is described as 

 new. 



Holotype, Cat. No. 20800, U. S. Nat. Mus., TD499. 



The holotype was opened in 1908 and the eggs removed. The 

 latter are elongate, elliptical, fully two and one-half times as 

 long as wide, thick, slightly flattened on one side, thus unlike 

 those of Trichiopoda and Xanthomelanopsis. 



Phorantha fenestrata Bigot. — Phorantha hridwelli Hine and 

 Phasia phasiatrata H. E. Smith are synonyms of this species. 

 The species appears to be, at least on the female, a true Phor- 

 antha, in which case Paraphasia falls to that genus. 



Imitomyia sugens H. Loew. — Saskatchezvania canadensis 

 H. E. Smith is the long-lost Himantostoma sugens of Loew, 

 The species seems to have become very scarce in the southern 

 part of its original range, if it has not died out altogether there. 



LITHOHYPODERMA, A NEW FOSSIL GENUS OF 



OESTRIDS 



By CHARLES H. T. TOWNSEND 



In 1877 Scudder, in the Bulletin of the U. S'. Geological and 

 Geographical Survey of the Territories, III, 756-8, described 

 certain fossil muscoid maggots found by Mr. W. Denton in 

 the White River shales of the Chagrin Valley, Colorado. Sev- 

 eral forms were distinguished and names proposed for four 

 of them, the most abundant form being named Musca ascarides. 

 In 1890, in the Tertiary Insects of North America, 551-4, PI. 

 5, Scudder quoted the original descriptions of these forms and 

 figured them. 



The United States National Museum collections contain a 

 large series of these fossil maggots. The best of them are from 

 the Roan Mountains, Colorado, collected by Scudder, and from 



