H. C. FALL,. 141 



tarsal characters, and also in the labrum, which encloses the epis- 

 toma at the sides. Elegans, however, does not share the structural 

 features upon which Adistemia has been founded, and is for the 

 present left with Cartodere, although an aberrant member of the 

 genus. 



ADISTEMIA gen. nov. 



The somewhat remarkable divergence from typical Cartodere in 

 the structure of the under body seems to require the separation of 

 C. watsoni under a new generic title. The characters upon which 

 this new genus rests are chiefly these : Front and middle coxre con- 

 tiguous, their cavities separated by a thin depressed lamina which is 

 not visible, or only very indistinctly so without dissection. Hind 

 coxae subcorneal and slightly prominent, the cavities falling far 

 short of reaching the sides of the body. Metasternum and first 

 ventral segment connate, the suture entirely obliterated between the 

 coxa?, but visible from the outer side of the coxa to the margin. In 

 no other member of the tribe Lathridiini occurring with us are the 

 front coxa? contiguous, while the other characters above mentioned 

 I have encountered nowhere else in the entire family. 



A. watsoni Woll. — Elongate, narrow, depressed, entirely rufotestaceous ; 

 head and thorax glabrous, elytra with sparse, extremely short, whitish erect 

 hairs, which are scarcely visible, except in profile, and are then very incon- 

 spicuous, except on the declivity. Head nearly twice as long as wide, truncate, 

 behind, sides a little rounded and convergent to the insertion of the antennae ; 

 labrum strongly dilated, enclosing the epistoma at sides and equal in width to 

 the head posteriorly; eyes small, situated at nearly twice their length from the 

 hind angles, and at almost twice that distance from the antennas ; surface finely 

 densely punctate, without costae or impressions. Antennae a little shorter than 

 the head and prothorax together, the first two joints larger, suboval, the first but 

 little larger than the second ; joints 3-5 twice as long as wide, 6-8 shorter, the 

 eighth but slightly elongate; last three joints forming the club, subequal in 

 width, 9-10 slightly longer than wide, eleventh nearly as long as the two preced- 

 ing united. Prothorax scarcely wider than the head, longer than wide, widest 

 before the middle, sides rounded and posteriorly convergent, surface densely 

 punctate, posteriorly broadly, but not deeply, transversely impressed. Elytra 

 very elongate, subelliptical, each with eight striae of rather coarse punctures, 

 intervals very narrow, except the third and seventh, which are broader and dis- 

 tinctly costate. Beneath densely punctate throughout, except the last two or 

 three ventral segments, the punctuation finer anteriorly, but quite coarse, on the 

 first two ventrals. Front and middle coxae contiguous or nearly so, their cavi- 

 ties separated by a very thin lamina, which is not distinctly visible; hind coxae 

 small, subcorneal and slightly prominent, widely separated. (PI. IV, fig. 36). 

 Length 1.4-1.65 mm. 



TRANS. AM. KNT. SOC. XXVI. NOVEMBER, 1899. 



