46 Memoirs on the Coleoptera 



3 — Elytra uniform in coloration, having more than three dorsal punctures, 

 which are always fine, sometimes also with fine diffused interstitial 

 punctures bearing each a small erect seta, though usually without 

 trace of diffused punctures. Atlantic to Sonoran regions. 



Section Stictanchus nov. 



Elytra dark, with abruptly defined pale areas, without diffused punctu- 

 lation, the dorsal series of three fine punctures all near the third 

 stria; prothorax still narrower, elongate, approaching the form seen 

 in Anchus Lee. Atlantic regions Section Deratanchus nov. 



These sections are of very unequal extent, the last consisting of a 

 single very peculiar species described as Platynus quadrimaculatus 

 by Horn; there are only three rather closely allied species in 

 Taphranchus,- but in each of the others there are a considerable 

 number of species, generally very well differentiated among them- 

 selves. 



Section Pseudanchus. 



This section comprises some of the types of Anchomenus more 

 commonly met with in the Pacific coast regions, though very few 

 have been described hitherto, and individuals are often very 

 abundant, especially in such damp localities as ravines and along 

 secluded water courses. The fourteen species at present known to 

 me are the following: 



Prothorax as long as wide or very nearly, except in the aberrant mor- 



hillosus 2 



Prothorax distinctly transverse; body notably small in size 7 



2 — Upper surface with distinct metallic lustre. Moderately convex, 

 shining throughout, similar in the sexes, black, with moderate 

 aeneous lustre, the anterior parts a little more greenish; legs and 

 palpi black; head elongate, nearly four-fifths as wide as the pro- 

 thorax; eyes large but only moderately prominent; antennae black, 

 slender, half as long as the body, the third joint evidently longer 

 than the fourth; prothorax as long as wide, the parallel sides feebly 

 arcuate, gradually becoming straight to very feebly and broadly 

 sinuate posteriad, the angles sharp; base and apex equal, the 

 apical angles prominent, only slightly blunt at tip; surface with 

 many transverse rugulae and faint anterior transverse impression; 

 sides finely but sharply reflexed; foveae large, rather deep, rugose, 

 extending to the middle; elytra one-half longer than wide, twice as 

 wide as the prothorax (9), nearly so (cf); sides parallel, moder- 

 ately arcuate and finely, sharply reflexed, more rounding at the 

 humeri; apex rather rapidly obtuse, the sinus short, very feeble; 

 basal margin joining the lateral in a broad arc; striae rather fine, 

 groove-like, coarser at apex; intervals flat, the three punctures 

 distinct; met-episterna much elongated; anterior male tarsi well 



