Dec , 1905 



.] Swenk: North American Species of Cuterebra. 183 



spot is just above the center of each anterior eye margin and contiguous to it. Vertex 

 at narrowest point five times as wide as distance between the posterior ocelli. Facial 

 depression shining black, its extreme basal depth slightly silvery pollinose. Antenna 

 deep brown, the arista and its hairs black except at extreme apex. Below the facial 

 depression and covering the area between the mouth and lower eye margins is a 

 yellowish pollinosity, relieved by a black spot contiguous to the lower apex of each 

 orbit another much larger one between this spot and the mouth, and a black line 

 which runs along each margin of the oral slit, widening to a spot posteriorly and con- 

 necting with the facial groove anteriorly. The area about the mouth is provided with 

 long yellow hairs, especially posteriorly. 



Thorax entirely covered with a long, very dense, brownish-yellow pubescence, 

 loncrer in a tuft above the wings. Pleura similarly pubescent except for a large space 

 abo & ve anterior cox* wh.ch is merely yellowish pollinose with a large, exposed and 

 bare black spot. Wings brownish. Legs black, with short concolorous pubescence, 

 the femora more or less white pollinose at base exteriorly. Abdomen reddish-brown, 

 shaped as in horripilum, the two basal segments clothed dorsally with long brownish- 

 yellow pubescence, denser laterally ; elsewhere the pubescence is minute and black. 

 All the segments (only slightly on the second) laterally and below with yellowish pollen 

 relieved by numerous small exposed spots of the ground color. Length, 23 mm. 

 Width of head at vertex, 9 mm. 



Type : One female, Lincoln, Nebraska, June. (R. H. Wolcott.) 

 Collection University of Nebraska. 



In addition to the strikingly different coloration of the abdomen, 

 the species differs from C. horripilum in the face marks as described 

 and figured by Brauer, having but one orbital pollinose spot above, 

 less silvery pollen in facial depression, a distinct black spot contiguous 

 to lower margin of eye, etc. 



Cuterebra albifrons, new species. 



O Head dull bluish-black on vertex and upper portion of front, except for a 

 brownish Y-shaped elevation surrounding ocelli and extending down the vertex, cov- 

 ered with short, scattered black hairs and a very minute and inconspicuous pale pu- 

 bescence, the latter most noticeable just above the facial depression. Vertex at nar- 

 rowest point five times as wide as distance between two posterior ocelli. On a level 

 with the upper edge of the facial depression, and extending from the eye margins 

 nearly to it are two transverse white pollinose bands, broadest at the orbits and extend- 

 ing in uniform width inward for one half their length, then by an abrupt incurving of 

 the upoer edge becoming a mere line and again abruptly widening into a subtnangular 

 terminal knob. A short distance ahove these bands on each side is a small pollinose 

 spot contiguous to the eye. On each side of the facial depression is a gourd-shaped 

 black spot the neck of which connects narrowly with the black of the upper face, 

 otherwise it is completely surrounded by a dense white pollinosity which covers almost 

 the entire lower half of the face. The depression itself is white pollinose, without 

 pubescence, and has a lanceolate black spot on each side of the lower margin. At the 

 lower margin of the eye and contiguous to it is a black spot and between it and the 



