352 Trans. Acad. Sci. of JSt. Louis. 



Ing; punctures of the head and pronotum extremely fine, feeble and 

 indistinct, close-set, of the tlytra only somewhat less fine but more 

 obvious, dense and feebly asperulate, of the abdomen very fine and close- 

 set throughout; color pale rufo-testaceous, the entire abdomen blacky 

 the legs and antennae pale, the latter inf uscate distally, the apex not 

 paler; pubescence pale and close but short and not very conspicuous; 

 head wider than long, subparallel at the sides, abruptly constricted at 

 base, the eyes rather large, convex; antennae short, only slightly longer 

 than the head and prothorax, gradually but feebly incrassate distally, 

 second and third joints only moderately elongate and subequal, the 

 subapical transverse, the eleventh deeply excavated near the apex; 

 prothorax fully a fourth wider than the head but only a fourth or fifth 

 wider than long, subparallel, widest before the middle, the sides broadly 

 arcuate, rather straighter toward base, the angles obtuse and slightly 

 rounded, the surface scarcely visibly transversely impressed before the 

 scuteilum; elytra about a fifth wider and nearly a third longer than the 

 prothorax, the humeri slightly exposed; abdomen distinctly narrower 

 than the elytra, long, parallel, the first three tergites only very narrowly 

 and feebly impressed at base, their surface flat and not convex as in the 

 two preceding species; basal joint of the hind tarsi as long as the next 

 two combined; sexual characters not evident. Length 2.1-2.5 mm.; 

 width 0.55-0.61 mm. North Carolina (Tryon) and Ohio (Cincinnati). 



semirnfa n. sp. 



Tricoloi', and possibly the allied" canonica also, sometimes 

 occurs in the company of a rather small piceous ant with 

 paler brow^n legs. 



Pliaenogyra Eey. 



The indication, on page 278 of the present paper, that 

 Pliaenogyra is an exclusively European genus, can fortunately 

 be corrected now by the chance discovery of a representative 

 among some unclassified material in my cabinet. This cir- 

 cumstance is interesting, not only in proving Pliaenogyra to be 

 American as well as European, but in being the only evidence 

 known to me of the occurrence of the subtribe Gyrophaenae 

 in California. It may be described as follows : — 



Rather stout, moderately convex and shining, blackish-piceous in color 

 throughout; the legs and antennae pale, the latter feebly infumate 

 distally; integuments coarsely and strongly micro-reticulate, the abdo- 

 men more feebly so; pubescence short, stiff and sparse; head trans- 

 verse, with fine scattered punctures except broadly along the median 

 line, the eyes moderate, prominent; antennae barely as long as the head 

 and prothorax, slender basally, abruptly stout from the fifth joint, the 

 latter to the tenth loose, feebly incrassate and strongly transverse, the 



