303 



dow of the Laboratory of Natural History at Urbana, and one was 

 captured at Muncie, 111., May 24, 19 14, on the bank of Stony Creek. 

 Male paratype on slide — Canada balsam. 



Nothing is known of the early stages. 



Hccmatopotiis and crepuscularis are closely related to stcllifer Co- 

 quillett, but may be separated from it by the wing and thoracic mark- 

 ings. The sketches given herewith (PI. XXII, Figs. 6, 7) represent 

 the normal markings of the wings of hcumatopotus and crepuscularis, 

 but occasionally the spot in the fourth posterior cell is larger, and the 

 upper half dilated on the inner side, giving it the appearance of two 

 coalescent spots, while the spot at apex of the anal cell is sometimes 

 distinctly divided at the middle. 



C. phlehotormis Williston is closely related to hcrniatopottis and cre- 

 puscularis, differing slightly in wing markings and in color of abdo- 

 men and legs. PJilebotouins occurs in St. Vincent, West Indies, and is 

 said to be "the common 'sand-fly' about the southern end of the island, 

 but is not very troublesome. Bites late in the afternoon, before sun- 

 set; sometimes during the heat of the day." — Williston. 



8. CuucoiDEs CREPUSCULARIS, n. sp. 



Male. — Blackish brown, opac|ue. Head black, basal half of anten- 

 nal flagellum pale brownish yellow, plumes yellowish, the short hairs on 

 apical antennal joints white ; palpi brown. Mesonotum covered with 

 dense yellowish gray pruinescence, and marked with brown as follows : 

 a central vitta on anterior half which generally assumes a diamond 

 shape posteriorly, an elongate spot on each side of the median line on 

 posterior half which does not reach posterior margin and falls short of 

 the transverse line of the apex of central vitta, a small spot on center of 

 posterior margin, an elongate lateral spot which is dilated laterad at 

 both extremities, the center of which is in transverse line with the space 

 between the apex of central vitta and anterior extremity of submedian 

 spot, a large irregularly shaped spot which extends from the depressed 

 area nearly to the wing-base, close along the lateral margin, being gen- 

 erally connected with the curved spot at the anterior extremity of the 

 submedian spot by a very fine line, and a pair of spots on the anterior 

 margin which generally connect with the central vitta at its anterior 

 extremity; scutellum with a brown central spot (PI. XXIII, Fig. 2). 

 Abdomen opaque blackish brown, the depressions on segments glossy. 

 Legs varying from yellowish to dark brown, generally with a paler 

 preapical band on femora and one on bases of tibise, and the tarsi 

 yellowish. Wings as in Figure 7, Plate XXII. Halteres yellow, knob 

 white. 



