American Carabotdea 175 



Irichroa and Scaphinottis , for which I would suggest the name 

 Megaliridia (n. gen.). 



As will be noted from the description of tenuiceps, the slender, 

 straight, internally hooked and spicularly denticulate mandibles, 

 are admirably fitted for seizing and withdrawing the soft bodies of 

 small snails from their shells. These food habits and attendant 

 structures extend, so far as I know, throughout the subfamily 

 Cychrinse. 



Brennus Mots. 



A considerable number of undescribed species of this genus 

 have become known in recent years, and I utilize this opportunity 

 to make known those that are in my collection at present. In 

 some cases the types described below have formed part of this 

 collection for many years, awaiting additional confirming evidence. 

 The former literature is so obscure and inadequate that it has been 

 very difficult to come to any positive conclusion in regard to the 

 older species, but it seems evident now that of the two large and 

 rather smooth species found near San Francisco Bay, striato- 

 ptindatus Chd., has a relatively moderate prothorax, with the 

 base about half the maximum width and alternatus Mots., which I 

 formerly identified as striatopunctatus, has a relatively large pro- 

 thorax, with notably broader base than in the true striatopunctatus. 

 The species from about Sta. Cruz, of rather large size and with 

 notably inflated hind body, more abbreviated than in the two just 

 mentioned, with coarser striae and with moderate prothorax, half 

 as wide at base as at the point of maximum width, is lativentris 

 Mots. I formerly identified it as ventricosus Dej., but the latter is 

 a much smaller species, with the hind body in comparison only 

 moderately inflated; Dejean gives the dimensions as 16.0 by 7.0 

 mm.; the stria are distinct to the sides, not broken up on the 

 flanks and my series is from Monterey. Crenatus Mots., is slightly 

 larger and stouter, the coarse deep striae coarsely and crenately 

 punctate, becoming confused only rather near the sides; my series 

 is from Sta. Clara; fuchsianus Riv., is a very isolated species of 

 large size and almost quadrate elytra, having feebler broken striae, 

 alternating with the moderate principal striae, the sculpture coarse, 

 deep and much confused broadly toward the sides; but it is prin- 



