THE CANADIAN ENTOMOLOGIST. 153 



Cordylura has the arista feathered, and the wings as long as, or shorter 

 than the abdomen, though some of our American species may have them 

 somewhat longer. Cleigastra might also be mistaken for an Anthomyiid, 

 particularly of the genus Cos?iosia, to which it bears much resemblance. It 

 may, however, be distinguished from that genus by having six abdominal 

 segments. The Afithomyiidce have only four or five abdominal segments, 

 usually four. The eyes of Cleigastra also are nearly round, while in 

 mnosia they are elongate. A large number of descriptions of North 

 American species of Cordylura and Cleigastra have been lumped together 

 in the O. S. catalogue under the genus Cordylura. Loew described nearly 

 all of these. Reference to these descriptions in most cases shows to 

 which genus they belong. Though the separating characters of the two 

 genera may seem insufficient, the division is warranted by the considerable 

 number of species. There are also in the catalogue one or two errors 

 which should be corrected. I give at the end of this paper a revised list 

 of the N. Am. species of the two genera as they should appear, based on the 

 character of the arista as learned by consulting each description, omitting 

 the repetition of references contained in the catalogue, except two 

 corrections. 



Reference to the descriptions of all the N. Am. species failed to 

 identify the present form, which is described below. The breeding of 

 this species as above detailed indicates that the last brood of larvae may 

 reach full growth at the time winter sets in and hibernate in the larval 

 state in the dung. With the milder weather and rains of spring such 

 larvre entirely abandon the dung to pupate in the earth. I have speci- 

 mens of the same genus captured in this vicinity (District Columbia) from 

 the 3rd to the 8th of May. It is extremely probable that many of our 

 coprophagous Diptera winter equally in the larval and pupal state. 

 Hcematobia, Lucilia and Musca are familiar examples, which I believe 

 may winter either as larvse or pupa3. In a state of nature the flies them- 

 selves rarely winter. 



Cleigastra stiisterci, n sp. 



Imago. % . Brownish cinereous. Head brownish or yellowish, nearly 

 round, elongate behind ; eyes blackish, round ; frontal vitta very dark red- 

 dish brown, W-shaped, cleft behind, almost reaching the eyes in front on each 

 side ; front very broad, not quite one-half the width of the head, with bristles 

 on each side, and longer erect bristles on the vertex ; antennaj not quite 



