214 MEMOIRS ON THE COLEOPTERA 



Length 1.25-1.3 mm.; width 0.43-0.48 mm. Texas (Austin). Three 



specimens diaphanus n. sp. 



6 Body oblong, subparallel, depressed, shining, feebly micro-reticulate 

 as usual; color pale flavo-testaceous throughout; head rather less 

 than three-fourths as wide as the prothorax, the anterior impressions 

 evident, the eyes larger than in any other species but only moder- 

 ately convex; antennae slender, flavate, longer than in any of the 

 preceding though submoniliform, nearly three-fourths as long as 

 the elytra, the medial and outer joints about one-half longer than 

 wide; prothorax very indistinctly narrower at base than at apex, one- 

 half wider than long, the sides rather narrowly rounded anteriorly, 

 oblique basally, becoming feebly sinuate toward the angles, which 

 are right and very sharp, apparently without the usual seta; sides 

 of the base oblique and sinuate, becoming transverse toward the 

 angle; anterior impression distinct, the posterior deep, strongly 

 angulate, the stria joining the two rather deep; elytra somewhat 

 over one-half longer than wide, nearly one-half wider than the pro- 

 thorax, parallel, with almost straight sides, rapidly obtusely round- 

 ing behind, the apices near the suture narrowly truncate; humeri 

 narrowly and abruptly rounded, the edge near the base minutely 

 setose and feebly serrulate; each has four fine but distinct equal 

 striae, which are feebly and irregularly punctulate; foveae rather 

 before basal and apical third. Length 1.5 mm.; width 0.5 mm. 

 Texas (Austin). Arizona and California, Hay ward. 



rufotestaceus Hayw. 



There are several characters relating to rufotestaceus that, to- 

 gether, are almost sufficient to make of it a distinct subgeneric 

 group of Tachys. The first and most important, if constant, is 

 the absence of the universal setigerous puncture at or near the 

 hind angle of the prothorax; in my single specimen there is no trace 

 of the seta and careful search reveals no inequality of the edge re- 

 sembling in any way a definite fovea, but more examples would 

 have to be examined before coming to a _ final conclusion. The 

 second character relates to the basally sinuate sides of the pro- 

 thorax and acutely rectangular basal angles, the third to the four 

 moderate subequal and punctulate elytral striae and the fourth to 

 the slightly longer antennas and decidedly larger eyes. The species 

 trechiformis of Hayward, will certainly constitute another well 

 marked subgeneric group. So, in the course of time, there will be 

 a considerable number of subgenera to record under Tachys, though 

 probably not comparable with the number at present composing 

 Bembidion. Tachyura, having the body oval, more strongly con- 

 vex and with denser and thicker integument, is in no way closely 

 allied to Tachys and should not be considered in close connection 



