H. C. FALL. 153 



%. Anterior tarsi rather strongly dilated; middle and hind tibite with a 

 moderately long mucro which is suhangnlate beneath. 

 9 . Front tarsi not dilated ; tibia; unarmed. 



i/rti.— New Hampshire, Massaelui.>*etts, New York, Pennsylvania, 

 New Jersey, District of Columbia, Indiana, Iowa, Illinois, Kansas. 



The dilated male tarsi is a character noticed in no other species in 

 our fauna. There is very little difference in the form of the elytral 

 tips in the two sexes. CJommon on locust, Rohinia pseudncacla. 



69. A. cordaliiin Smith.— Black, plainly pubescent. Beak {%) moderate, 

 slightly dilated with numerous punctures in basal half, especially towards the 

 sides; apical half polished with a few fine punctures; (?) longer, scarcely 

 dilated, less polished, apically and more finely punctate. First joint of antennas 

 as long as the two or three following, second joint reaching the eye. Front 

 scarcely wider than the tip of the beak, feebly or not sulcate; eyes moderately 

 prominent. Prothoras as long as broad; sides arcuate, widest at the middle; 

 slightly sinuate before the base, moderately, densely, coarsely punctate with an 

 elongate basal fovea. Elytra one-half longer than wide, parallel or slightly wider 

 posteriorly: humeri moderate; intervals more or less convex. Beneath rather 

 closely, not very coarsely punctate ; legs moderate; claws strongly toothed. 

 Length 2-2.5 mm. ; .08-.10 inch. (PI. IV, fig. 3). 



% . Sutural angles rounded : middle and hind tibige with a rather long mucro, 

 which is dentellate near the tip. 



9. Sutural angles scarcely rounded ; tibiie unarmed. 



Hab. — Pacific Coast, from Washington to Southern California. 



The difference in the form of the body is perhaps sexual, as in 

 the material examined all the males have the elytra wider behind, 

 while in the females the sides are parallel ; a condition of affairs 

 just the reverse of what would naturally be expected. 



70. A. oblitiltn Smith. — Black, moderately pubescent ; the hairs more scale- 

 like than in rostrum. Beak .scarcely as long as the head and prothorax, rather 

 slender, feebly dilated, attenuate, punctate about the insertion of the antennae, 

 polished and very sparsely punctulate from thence to tip, scarcely differing in 

 the sexes, except that it is very slightly longer and a little less shining in the 

 female. First joint of antennse rather short, barely equal to the two following, 

 second reaching the eye. Front with a feeble sulcus; eyes moderately promi- 

 nent. Prothorax as long as wide, width behind the middle subequal to or a 

 little wider than at the base ; sides rounded ; apical constriction and basal sinua. 

 tion well marked ; punctuation close but not dense and with the usual basal 

 fovea. Elytra nearly two-thirds longer than wide; humeri moderate; sides 

 nearly straight, except for the post-humeral sinuation, and diverging to behind 

 the middle; surface finely rugulose; intervals fiat, twice as wide as the strise. 

 Beneath not very coarsely, rather sparsely punctate. Length 2-2.4 mm.; .08- 

 .095 inch. 



%. Sutural angles rounded; all the tilna> feebly nnicronate, the front pair 

 very minutely so. 



9. Sutural angles not rounded ; tibipe unarmed. 



TRANS. AM. ENT. SOC. XXV. (20) OCTOBKR. 1898. 



