286 MEMOIRS ON THE COLEOPTERA 



erect setae of the elytra in unicolor do not exist in the two examples 

 of parviceps at hand. At any rate, unicolor is a very aberrant 

 species in Stenolophus and may require a special genus. 



Tachistodes n. gen. 



This is another genus between Stenolophus and Agonoderus, but 

 closer to the latter than to the former. The body is very small in 

 size and convex, with large head and very prominent eyes, rather 

 short and thick antennae, which are more nearly as in Agonoderus, 

 to which genus the species are now attached in the lists. The 

 prothorax is nearly as in that genus and has the basal angles simi- 

 larly rounded, but the scutellar stria of the elytra is extremely 

 short or obsolete. The hind tarsi are still shorter than in Agono- 

 leptus and almost as in Agonoderus, except that they are filiform 

 and not tapering from base to tip as in that genus; the first three 

 joints decrease rather uniformly in length, the first being very 

 much shorter than the fifth. The anterior tarsi of the male are 

 but feebly swollen and have beneath a double series of very small, 

 short, thin and hyaline squamae, the intermediate tarsi wholly 

 unmodified. The emargination of the mentum is small, deep and 

 narrowly parabolic in form, with the edges of the notch duplex 

 and beveled and there are two erect setae on the mentum near the 

 notch. The ligula is short, narrow, only feebly enlarged apically 

 and the paraglossae are diverging, rather thick and curl inward. 

 The labial palpi are as in Stenolophus but shorter and the second 

 joint bears the three setae of that genus, of which the tw r o regular 

 ones of the tribe are medial on the anterior margin, the apical very 

 long and on the posterior side; the maxillary palpi and inner and 

 outer lobes of the maxilla are also as in Stenolophus, the fringe of 

 the inner lobe rather short and fine. The mandibles are short and 

 the oblique frontal foveae attain the eyes. The elytra have one 

 long seta and several short ones at the margin near the base and 

 two long ones posteriorly, nearly as in most of the Stenolophi; the 

 elytral striae and intervals are only slightly stronger on the apical 

 declivity. 



There are comparatively few species and these are well differ- 

 entiated among themselves as follows: 



Head very large, only just visibly narrower than the prothorax, with 



