Baring 44 i 



prothorax nearly one-half wider than long, the sides converging and 

 evenly, distinctly arcuate to the feeble constriction; sculpture coarse; 

 basal lobe small; scutellum subquadrate, with six or eight slender 

 squamules; elytra broad, with very oblique, evenly arcuate sides 

 and narrowly rounded apex, a fourth longer than wide, slightly 

 wider than the prothorax and more than twice as long; striaj moder- 

 ate; intervals alternating slightly. Length (9) 2.35 mm.; width 

 1. 15 mm. Mexico (Vera Cruz) *rugicollis n. sp. 



In my series of helvinus, there are several specimens which seem- 

 ingly indicate that some subspecific forms are now confused with 

 the typical species from Indiana, but I have neither time nor material 

 at present to more than allude to this; it was the slightly greater 

 concentration of scales on some of the strial intervals, that misled 

 me, however, into the statement that alternatiis and helvinus are 

 subspecifically related; this is so far from being the case in reality, 

 that attention should now be drawn to the fact of there being no 

 close affinity whatever between these two species, the prothorax of 

 alternatiis — much broader and larger, with more arcuate sides and 

 narrower apex — would alone prove them to be distinct; alternatiis 

 is the largest species of the genus known to me at present. 



An examination of the mandibles shows that mendax, described 

 under the genus Gerceus by Mr. Champion, and kindly sent me by 

 the author, comes truly under typical Centrinopus. 



The specimens of uniseriatus described above, were sent to me 

 by Mr. Champion under the name Gerceus simulator Chmp., but 

 uniseriatus is much smaller and has very sparse elytra! squamules, 

 for the greater part in single lines. 



Centrinites Csy. 

 The slightly decussate and internally bidentate mandibles and 

 peculiar strigilate sculpture of the prothorax, distinguish this 

 genus from others more or less allied, as for example the much 

 smaller and more abbreviated Centrinopus. A number of Mexican 

 and Central American species have been described by Mr. Champion, 

 and the following is allied to strigicollis but very much smaller: 



Centrinites egenus n. sp. — Elongate-oval, much smaller and narrower 

 than strigicollis, piceo-rufous in color and feebly shining; squamules of 

 the pronotum small, dark and indistinct but pale and evident in a sub- 

 lateral vitta and very narrowly along the median line toward base, on 

 the elytra narrow, elongate, very sparse, almost uniform, inconspicuous 



