76 
PRELIMINARY LIST 
with rufous throughout and has no black on the propleura. 
Colorado Springs, August 3d (Uillette). 
Idiocerus lachrymalis Fitch. 
Det. VanDuzee. 
Colorado (VanDuzee, 4). 
Estes Park, July 12th; Steamboat Springs, July 26th; 
Rist Canon, July 80th (Gillette). 
Idiocerus mimicus n. sp. 
Female: Face one-fifth wider than long, faintly shagreened; clypeus a little less 
than two-thirds longer than broad, moderately broadened at the rounded apex; lorae 
considerably longer and almost as broad as the 
clypeus; genae moderately depressed beneath the 
eyes, lateral margins straight, attaining tip of 
clypeus, broad beneathiorae; front slightly longer 
than broad, nearly twice as long as the clypeus. 
Vertex finely transversely wrinkled, length at 
middle same as next the eyes; width between the 
eyes five times the length at middle. Pronotum 
finely transversely shagreened, a little more than 
two and one-third times broader than long, three 
times longer than vertex, curvature little more 
than two-thirds of the length Scutellum finely 
shagreened and with the transverse groove as in 
interruptus. Last ventral segment as in rufus. 
Color pale yellowish brown, unicolorous except two 
distinct black spots on the crest of the vertex, and 
the nervuies of wings and basal angles of scutellum 
rufous. 
Length 4.5 mm. Described from one female. 
Form of alternatus but more robust. 
Fort Collins, August 18th on black- 
walnut (Baker). 
Idiocerus nervatus VanD. Det. VanDuzee. 
Colorado (VanDuzee, 1). 
Lamar, May 7th; Trinidad, May 
14th (Gillette). On Bedstone Creek, twelve miles south¬ 
west of Fort Collins, August 1st; Fort Collins, September 
14th on Solidago (Baker). The dark nervures of the wings 
are not a distinguishing characteristic of this species as 
certain forms of pallidus also possess them. 
Idiocerus pallidus Fitch. 
Quite common in Clear Creek Canon, also near the South Platte and its 
tributaries near Denver, and at Manitou and Colorado Springs, chiefly upon 
willows, August 6th to 18th (Uhler, 5). Mountains, June (Carpenter—see 
Uhler, 6). Colorado (VanDuzee, 4). 
Female: Face an eighth wider than long, finely shagreened; clypeus one-half longer 
than broad, broadest near the tip where it is suddenly widened, apex rounded and broadly 
