186 CALIFORNIA ACADEMY OF SCIENCES. [30] 



REICHENBACHIA Leach. 



The species are numerous, as a rule smaller than in the 

 preceding genus, and especially distinguished by the rather 

 finer abdominal border and the dorsal surface similar in 

 both sexes. The species here described may be assigned 

 as follows: — 



Head $ and 9 with three fovea?. 



Antennas dissimilar in the two sexes. 



lumorosa, tumidicornis and informis. 



Antennae similar in the stxes g racilicornis and nevadensis. 



Head tf and 9 bifoveate. 



Antenna dissimilar in the sexes fundata and franciscana. 



The special relationships will be indicated under each 

 description/ 



It. tumorosa n. sp.— Rather robust; color rather dark rufo-castaneous; 

 antenna concolorousiu the middle, paler at base and toward the apex; elytra 

 and legs paler, much more flavate, the former not darker at apex; pubescence 

 fine, short, not at all flense. Head rather small; eyes moderate, prominent, 

 very coarsely granulate, at nearly their own length from the base; front trans- 

 versely and rather strongly convex, almost completely impunctate, highly 

 polished, having on a line through the middle of the eyes, two small, deeply 

 impressed fovea, mutually three and one-half times as distant as either from 

 the eye; with a large, deep impression between the antenna at the bottom 

 of which there is a very minute, spongy-pubescent fovea; apex strongly 

 declivous, angularly and slightly produced in the middle; antenna rather 

 shoit, rob.ist, as long as the head and prothorax together; first joint mod- 

 erate, second smaller, subglobnlar, third wider, short, strongly transverse, 

 triangular, closely adjacent to the fourth, which is very large, strongly- 

 transverse; joints five to eight, transverse, very rapidly and uniformly di- 

 minishing in width, sixth shorter than the seventh, eighth normal, eight to 

 eleven evenly, very gradually increasing in width. Prvthorax moderate in 



4 The long, erect, stout seta, growing upon the lower surface of the head 

 are sometimes uulbous at the extremiiy, the enlargement being apparently 

 formed of a viscid substance which may perhaps be a secretion. If, how- 

 ever, this is the case, the seta are in all probability hollow tubes. It may 

 be this secretive matter which is so pleasing to ants, with which so many 

 species of Pselaphida are associated. The same appearancs of the seta has 

 been before referred to in a short paper on our Euplectini (Cont. II, p. 94), 

 although at that time I had not remarked the viscid nature of the material 

 forming the enlargement. 



