LEPTID7E. 43 



at its tip there are two triangular, sharp, flat, chitinous hooks, 

 and below them some stiff bristles. The booklets serve as 

 aids in boring in the sand and to fix themselves ; the organ on 

 the fifth segment enables the larva to seize and hold its prey, 

 and also in constructing the pitfalls. The larva; of the Lep- 

 tinse in general are cylindrical, with or without fleshy abdom- 

 inal legs. The last segment has a transverse cleft, the portion 

 above which is provided with two, often backward-bent points 

 or processes ; the under part is obtuse, with the two stigmata 

 between them. 



TABLE OF CENEEA. 



1. Tliird joint of the antenna; complex, the antenna^ more or less elongated ; 



five posterior cells present. ....... 2 



Antennae short or hut little elongated, the third joint simple, with a ter- 

 minal or dorsal arista or a terminal style; face small, excavated; 

 proboscis short; some or all of tlu' tiliiie spurred. . LeptiNvE. 



2. All the tibiae with spurs. XvLOPiiAGiNyE. 



Front tibi;e without spurs. . . . . . Autiiroceratin.'ic. 



XYLOPHAGIN^. 



1. All four jjosterior veins (i. e. the veins separating the j)osterior cells) 



arise from tlie discal cell ; head small; scutellum with spines. 



CoENOMYiA Latreille. 

 The last posterior vein arises from the second basal cell, the fifth pos- 

 terior cell hence not contiguous at its base with the discal cell ; 

 scutellum without sjjines. ........ 2 



2. Third joint of the antennse acute at tip, . . Authropeas Loew. 

 Third joint of antenna^ iu)t acute at tiji. ......•> 



."!. Fourth i)ostenor cell closed; the third joint of the anteniue much elon- 

 gate, composed of numerous, distinct divisions, often pectinate; eyes 

 emarginate near the antenna-. . . . Euacmicerus Ilaliday 

 Fourth ])osterior cell oj)en ; third joint of antennfe composed of eight 

 ammli, indistinctly separated. . . Xylopuaohs Meigeii. 



AHTUUOCKltATTNTE. 



1. Fourth posterior cell open. .... 



Fourth i)ostcri(jr cell closed. {Siiliiihi ])reoc.) SuiuM.i ( >m 



via nom. nov. - \U l<r 



