new genera and species of Tenthrediaid(B. 147 



panyiiig box, in wliicli also I found a ? fly." Farther on 

 (p. 251) he mentions that there Avere only three males to 

 twenty females. The ? belongs to King's second section, 

 while the $ belongs to the fifth ; that is to say, it has 

 only tlu'ee submarginal celhiles. In the ^, also, the cly- 

 peus is not nearly so deeply notched ; the head is bluish- 

 black, with the exception of the mouth, the meso- and 

 metathorax bluish-black above, the posterior tibife are pale 

 red; the first tarsal joint is longer. Besides the above- 

 mentioned differences in the alar nevu*ation in the $ , the 

 wings are clear hyaline instead of having three distinct- 

 clouded bands. IS o doubt, as Curtis points out, the sexes 

 in some species of Tentliredinidce differ very much, but 

 I know of no case where we have so many different marks 

 of distinction, while in the other species of the Hyloto- 

 mides we have not, so far as I can remember, any great 

 diversity in coloration, and certainly none in structure. 

 Although, then, I cannot consider them to be the sexes 

 of the same insect, still they agree so closely in their 

 generic characters that I think they may both be placed 

 in the same genus. It is clear that the ? must be regarded 

 as the type of the genus, as the descriptions of the mouth- 

 organs, &c., were taken from four female specimens. The 

 $ I propose to name 



Dielocera Curtisi, sp. n. 



$ . Bluish-black, the mouth, palpi, basal joint of antennjE, 

 pronotum, thorax beneath, and legs red ; the tibia3 and 

 tarsi pale A\'hite at the base ; the posterior tarsi with the 

 tips fuscous. Wings clear hyaline. Antennse forked, 

 densely pilose. 



Length 5 g lines ; alar exp. 1 1 lines. 



Hab. — Brazil. 



The Hylotoma formosa of Klug resembles this species 

 in some respects, but it has the posterior legs black, and 

 the wings are clouded at the middle and apex. 



Dielocera carbonaria, sp. n. 



2. Antennse compressed, sabre-shaped, bare, the two 

 basal joints very closely united, the second very small and 

 truncated at the apex. Epistoma carinated, the carina 

 spreading out on each side above the antennre ; the cly- 

 peus large, Avith a shallow emargination ; labrum small. 

 Wings Avith one marginal and three submarginal cellules ; 



