1 66 MEMOIRS ON THE COLEOPTERA 



different structure, being small, slender and widely forked through 

 more than half its length, the arms widely diverging Group II 



Possibly the very small species, with much less developed head, 

 allied to bidentatus Burm., will constitute another subgenus, but 

 the male is unknown to me at present. In fact the male, through- 

 out this part of the tribe, seems to be much less abundant than the 

 female, which is another point of difference. 



Group I. 

 Subgenus Dyscinetus in sp. 



As there are a considerable number of species in my collection, 

 most of which seem to be undescribed, I have ventured to include 

 several South American species in the following statement: 



Body larger in size, with the head well developed, the prosternal process 



dilated at apex 2 



Body small in size, the head less developed. Brazil 1 1 



2 Pygidium discretely punctate in both sexes; clypeus rugulose 3 



Pygidium at least in part densely scabriculate in both sexes; clypeus 



finely and sparsely punctate 9 



3 Elytra with the punctures very fine and feeble, sometimes obsolete. 4 



Elytra with the punctures everywhere very distinct 7 



4 Abdominal segments without trace of transverse series, confusedly 

 punctate toward the sides. Form short and subquadrate, deep 

 black, shining, the legs blackish-piceous; head rather more than 

 half as wide as the prothorax, with sparse and moderate shallow 

 punctures, the clypeus broadly trapezoidal, shining, not densely 

 or strongly rugulose, the edges all sharply reflexed, the apex sinuato- 

 truncate, the apex below the margin externally broad and minutely, 

 closely punctulate; surface gradually declivous toward the sides, 

 the suture distinct, broadly, feebly angulate; antennal club small as 

 usual; mentum tumid anteriorly; prothorax short and transverse, 

 a little wider than the base of the elytra, fully twice as wide as long, 

 with parallel and rounded sides, broadly rounded basal angles and 

 thick convex base, the punctures sparse and distinct but shallow; 

 scutellum broadly ogival, perfectly sculptureless; elytra barely as 

 long as wide, obtuse at apex, the sides strongly arcuate, slightly 

 more prominent medially, the edge thick, thinner apically; surface 

 smooth, finely, sparsely punctate, with three flat double series, the 

 punctures toward the sides becoming almost obsolete; pygidium 

 with coarse and irregular, unevenly distributed and rather shallow 

 punctures; tarsi slender, rather short. Length (9) 16.0 mm.; 

 width 9.3 mm. Mexico (near the city), Wickham. 



*subquadratus n. sp. 



Abdominal segments each with a single series of punctures toward the 

 sides, with a few dispersed punctures also at the extreme sides; body 

 more elongate-oval, the elytral sculpture still more obsolete 5 



