74 
PRELIMINARY LIST 
ville, August 23d; Trinidad, May 14th; Montrose, June 24th 
(Gillette). Fort Collins, October 7th; Dixon’s Canon, May 
6th; Steamboat Springs, July 15th, on willow (Baker). 
A common species everywhere. There seems to be con¬ 
siderable variation in the form of the last ventral segment 
in the female. 
Idiocerus amoenus VanD. Det. VanDuzee. 
Colorado (VanDuzee, 4). 
Horsetooth Mountain, July 4th; Steamboat Springs, July 
26th; Montrose, June 24th (Gillette). On Red Stone Creek 
twelve miles south-west of Fort Collins, August 1st (Baker). 
Idiocerus interruptus n. sp. 
Female; Face about a ninth wider than long; clypeus one-half longer than broad, 
gradually broader towards the almost truncate apex, basal suture straight; lorae a little 
longer and almost as broad as the clypeus; genae rather narrow, the outer margins 
straight, attaining tip of clypeus, moderately broad 
below the lorae; front oi e-fourth longer than 
broad and nearly three times as long as the clypeus. 
Face, pronotum and scutellum finely shagreened. 
Vertex finely, transversely wrinkled, about one- 
fourth longer at the eyes than at the middle, dis¬ 
tance between the eyes a little less than five and a 
half times the length at the middle. Pronotum a 
little more than twice as broad as long, and three 
and a half times the length of the vertex; the 
curvature a little more than two-thirds the length 
of the pronotum; transverse groove of scutellum 
angularly bent forward and obsolete at the center, 
appearing as two oblique lunate depressions. Last 
ventral segment with the hind margin shallowly 
notched and the posterior angles obliquely cut off. 
Color pale yellow marked with brown and black; 
face mottled above with brown; eyes brown. Vertex 
brown with a yellowish white line next the e^es, 
and a median longitudinal white line, and a small 
black spot on either side. Pronotum brown with a 
broad median longitudinal white band, anterior 
margin whitish with about four small blackish spots 
on either side; scutellum whitish with a large black 
spot just within the basal angles on either side; a 
median brown line between base and transverse 
groove, forked beyond and extending nearly to the 
tip; a small black spot on either side just b* fore the 
ends of the transverse groove. Elytra whitish sub¬ 
hyaline, with an oblique brown band on the middle 
extending down and forward, veins brown inter¬ 
rupted with white, a large white spot on the middle 
of the clavus, with a smoky spot in front and another on the tip; all beneath uni- 
colorous, legs slightly washed with rufous, propleura with a black spot. Length 5 mm. 
Male: Differs from female as follows: Below deeper yellow, white lines next the 
compound eyes obsolete, other light marking on the vertex and pronotum yellowish, most 
of the dark markings darker; front margin of anterior coxae with a large black spot, and 
narrow black lines on the outer sides of all the tibiae; compound eyes jet black; black 
