AMERICAN COLEOPTERA. 291 



A. Strigata Lee. — Oval, very little oblong, pale castaneous, shining. Head 

 sparsely punctate. Thorax more than twice as wide as long, nnuch narrowed 

 in front, apex eniarginate, sides feebly arcuate, base truncate, hind angles 

 obtusely rectangular, surface shining very sparsely finely punctate. Elytra 

 as wide at base as the thorax, not wider posteriorly, sides moderately arcuate, 

 humeri not oblique, sutural stria moderately deeply impressed behind the 

 middle, surface with moderately coarse punctures in regular rows, those of 

 the striae proper and intervals nearly equal and with oblique grooves uniting 

 the punctures, more evident on the disc near the base. Metasternum and 

 abdomen finely alutaceous. Length .08 inch; 2 mm. 



Male. — Anterior tarsi slightly, middle tarsi feebly dilated, posterior tibiae 

 straight. 



jPemo/e.— Tarsi slender. 



This is the only species known to us with oblique strio'te on 

 the elytra, in fact it is rather a coarse oblique grooving than 

 a true strigosity such as is seen in Colenis impunctata. This 

 character will readily distinguish it from any other known at 

 present. 



Occurs in the Lake Superior region and in Colorado. 



A. obsoleta Mels. — Broadly oval, rufo- testaceous or pale castaneous, moder- 

 ately shining, convex. Head sparsely punctate. Thorax more than twice as 

 wide as long, narrowed in front, apex eniarginate, sides and base arcuate, hind 

 angles rounded, surface sparsely and finely punctate. Elytra as wide at base 

 as the thorax a little wider posteriorly, form broadly oval, nearly as wide as 

 long, base at sides not oblique, surface substriate, striae with coarse, deep and 

 closely placed punctures forming eight entire rows without the short sub- 

 humeral row, intervals flat or slightly convex, sparsely finely punctulate, 

 the alternate intervals with coarser punctures most evident on the third. 

 Metasternum shining, sparsely punctate. Each abdominal segment with a 

 row of coarse deeply impressed punctures along the basal margin. Length 

 .06— .10 inch ; 1.5—2.5 mm. 



Male. — Anterior and middle tarsi feebly dilated, middle tibia slightly arcuate, 

 outer condyle of posterior femur prolonged in a triangular tooth, the femur 

 itself gradually broader from the base to apex, posterior tibia straight but 

 stout. (PI. VII, fig. 4 b). 



Female. — Tarsi slender, middle tibia straight, posterior femur somewhat 

 broader externally but without dilated condyle. 



This species is one of a small group in which the eight rows of 

 punctures are entire and attain the base of the elytra without diminu- 

 tion, and there is no trace of a short subhumeral row of punctures 

 which is the beginning of a ninth stria and exists in the vast majority 

 of the species. 



The mimicry between this insect and Ci/rtusa blandissima is com- 

 plete, and is even carried to the sculpture of the body beneath as 

 well as the male sexual characters. The auteunal groove in the 

 Oyrtusa and the mesosternal carina in the present will always dis- 



