224 MEMOIRS ON THE COLEOPTERA 



tenth not quite twice as wide as long, the last obtuse, scarcely as long as 

 the two preceding; prothorax two-fifths wider than long, nearly parallel, 

 just visibly widest and with the sides feebly arcuate before the middle, 

 the basal angles moderately obtuse, distinct, the surface unimpressed; 

 elytra slightly shorter than wide, a fourth wider and nearly one-half 

 longer than the prothorax; abdomen parallel, slightly narrower than the 

 elytra, the fifth tergite well developed as usual. Length 1.6 mm.; 

 width 0.35 mm. Texas (Austin). 



Distinguishable at once from any other species by the much 

 longer third antennal joint, form of the prothorax and better 

 developed eyes and elytra ; the type is a female. 



Tetralina n. gen. 



Body fusoid, moderately stout and slightly convex, minutely, 

 densely punctate and pubescent throughout, with long slender 

 filiform or feebly incrassate antennae, large prominent eyes and 

 without infra-lateral cephalic carinae; the hypomera are feebly 

 inflexed, flat and wholly visible from the sides, the elytra well 

 developed, the apices laterally feebly sinuato-truncate; the ab- 

 domen is feebly tapering, the first two tergites feebly impressed 

 transversely at base, the remainder apparently unimpressed; they 

 are all rather flat, the fifth much longer than the fourth; middle 

 coxae well separated, the mesosternal process short, not quite 

 extending to their middle, its apex broadly obtuse and rounded, 

 separated from the moderate and subtriangular metasternal pro- 

 jection by a rather long, much depressed interval; legs long, the 

 tarsi all 4-jointed, the posterior long, slender, filiform, densely 

 clothed with short stiff pubescence, the basal joint very long, 

 exceeding the next two combined, the claws rather long, very 

 slender, evenly and just visibly arcuate. 



This genus, as can be perceived from the above diagnosis, is 

 wholly different from any other known from the nearctic regions 

 and does not seem to be represented by any closely allied form in 

 the palsearctic fauna. The hind tarsi might seem suggestive of 

 Myllcena, but there is little or no resemblance otherwise, except 

 in the fine dense sculpture and pubescence of the body; the maxillary 

 palpi are well developed but are of the usual type, except that the 

 terminal acicular joint is small. There are three species as follows, 

 the first being the type of the genus: 



