CERAMBYCID^: 267 



are probably some other subgeneric groups in our fauna, necessitated 

 by species that I do not have before me at present, such perhaps as 

 brevicornis Lee. 



Group I. 

 Subgenus Megaleptura nov. 



The two very large and conspicuous species emarginata Fabr., 

 and gigas Lee., alone constitute this rather isolated subgenus. 

 They are well known, though owing to their strong and high flight, 

 are difficult to capture and therefore not over common in collections. 

 They are throughout of a brilliant glossy black, the elytra dull and 

 rufous, with black tips, feebly and closely lyrate in gigas, plain in 

 emarginata. 



Group II. 

 Subgenus Cosmosalia nov. 



There are eight species in my collection assignable to this sub- 

 genus, comprising, among those heretofore described, nigrella Say 

 and the closely allied though more elongate carbonata Lee., also 

 auripilis and dolorosa of LeConte, chrysocoma Kirby the type of 

 the subgenus and nigrolineata Bland; it is probable that coccinea 

 Lee., should also be included. The following is allied to nigrella 

 and carbonata: 



Leptura (Cosmosalia) praestans n. sp. Form very elongate, narrower 

 and rather less convex than carbonata, deep black and moderately shining, 

 the elytra throughout bright red, excepting a marginal sharply denned 

 streak of black in posterior two-fifths; pubescence very short, blackish, 

 erect on the anterior parts ; head moderately finely, very densely punctate, 

 the tempora slightly more prominent than the eyes, tumid and subangu- 

 late, transverse at base; antennae (9 ) rather slender, extending barely at 

 all behind the middle, the tenth joint twice as long as wide; prothorax 

 as in nigrella but more unevenly punctate, the punctures medially and 

 laterally moderately coarse and densely confluent, between these areas 

 coarser and well separated, the smooth median line distinct, tumid on 

 the basal declivity; elytra two and one-half times as long as wide, two- 

 thirds wider than the prothorax, the sides parallel, abruptly rounding 

 near the middle, thence straight and moderately converging to the broad 

 apical arcuation extending to the narrowly sinuate apices, the punctures 

 a little smaller and less close-set than in nigrella or carbonata, much less 

 rapidly coarser basally than in the latter; abdomen shining, finely, 

 sparsely punctate. Length (9) 19.0 mm.; width 5.8 mm. Colorado. 



