166 Journal New York Entomological Society. [v<.i. viii. 



rather short, slender, the femora but slightly dilated, the tarsi much 

 shorter than the tibiae, 4-jointed, the three basal joints small, the first 

 with a brush of long hairs beneath, the fourth long and notably stout, 

 the claws well developed, divaricate, slender, simple and arcuate. 

 Epipleurje extending almost to the sutural angles but narrow throughout, 

 scarcely at all dilated but horizontal toward base, inflexed behind the 

 middle. 



The extremely minute species having the assemblage of characters 

 given above is one of those aberrent forms continually occurring 

 among the serricorn Clavicornia. It may be described as follows : — 



Body narrow and parallel, testaceous, the elytra blackish and the under surface 

 piceous, the legs and antennje pale ; sur^jce rather shining ; head nearly three- 

 fourths as wide as the prothorax, the antennce as long as the width of the head ; 

 [irothorax about a fourth wider than long, the sides rather prominently rounded 

 at apical fourth, thence feel)ly convergent and straight or broadly, feebly sinuate 

 nearly to the basal angles, which are somewhat obtuse ; apex broadly arcuate, 

 ecjual in width to the base, which is even and subtruncate ; disk feebly convex, 

 declivous at the sides, very minutely and feebly margined at base, minutely and 

 rather sparsely punctate, each puncture with an extremely minute hair ; elytra 

 nearly twice as long as wide, scarcely visibly wider than the prothorax, rather 

 obtusely rounded at tip, the sides parallel and almost straight, the humeral angles 

 right and well defined ; disk with even feebly impressed series of small punctures, 

 the intervals each with a series of extremely minute punctures, each of which bears 

 a very short, stiff erect hair. Length 1.05 mm.; width 0.35 mm. California 

 (Mokelumne Hill, CalverasCo.) — Dr. F. K. lilaisdell blaisdelli, sp. nov. 



No notes concerning the habits of this species have come to me, 

 but probably they do not differ from those of other members of the 

 family. 



MELANDRYID^. 



Tetratomini. 

 The definition of this tribe must be enlarged to include all those 

 Melandryids, with simple claws, which have the outer three or four 

 antennal joints abruptly dilated to form a strongly developed loose and 

 parallel club. The genera may be defined as follows : — 



Last four joints of the antenna? dilated ; eyes well developed, emarginate anteriorly ; 

 pronotal fovea; distinct 2 



Last three joints abruptly and strongly dilated, forming a loose clul) ; eyes emarginate 

 or sinuate anteriorly, generally less developed ; abdominal sutures moderately 

 fine ; edges of the prothorax subeven 4 



2 — Pronotal margins not reflexed at the sides ; basal segment of the abdomen about as 

 long as the next two combined ; joints of the antennal club pedunculate, the 

 seventh not much dilated Tetratoma 



