No.TiOfi. ICHNEUMON FLIES— ASHMEAD. 47 



leos, but the shape of the iihdomeii and the venation of tlie I'l-ont 

 winys can alwa3"s ])e depended upon to disthit»-uisli them. 

 Sixteen genera have l)een recognized separable as follows: 



TABLK ()!•' (iENERA. 



Front wings irilJKnit an areolet 6 



Front wings irith an areolet. 



Areolet small, not rhoinboidal; ovipositor shorter than the abdomen; if as long, 

 tlien the hypopygium unusually large 2 



Areolet large, rliomboidal; ovipositor as long as or longer than the abdomen; 

 head as in exctartes, but readily distinguished by the longer oviposi- 

 tor (287) Leptohatc^ Gravenhorst. 



2. Alxlomen sessile, not long petioliform 3 



Abdomen petiolate, or the lirst segment long, slender, petioliform. 



Areolet small, petiolet; abdomen elongate, narrowed toward base; claws 



pectinate (288) Leptobaiopsis Ashmead, new genus. 



(Type, Li'ptohatopsis aiistrcdierms Ashmead, manuscript.) 



3. Ovii)ositor nol longer than the abdomen, or if longer the hind legs are very 



thick; antennje short and straight 4 



Ovipositor longer than the abdomen, the hypopygium umisually large, lanceo- 

 late; mesonotum trilobed; metanotum not areolated with from two 

 to four longitudinal carinse, the spiracles rather large, oval. 



(289) Coleoccntnts Gravenhorst. 



4. I)isco-cul)ital nervure »v7/(o»/ a stumi) of a vein; hypopygium in female large, 



projecting beyond the tij) of the abdomen 5 



J)isco-cril)ital nervure 'with a stump of a vein or branch; hypopygium in female 

 short; metanotum vilhovt carin;e; ovipositor longer than the alxlo- 

 men - ( 290 ) ProcinctUK Fiirster. 



5. Transverse median nervure in hind wings broken at the middle; metathorax 



laterally coarsely rugose, the middle space i)unctured but shining, 

 the spiracles large, oval; ovipositor longer than the abdomen. 



(291) Mesoel i stus Forster. 

 Transverse median nervure in hind wings broken far below the middle; meta- 

 thorax short, truncate i)osteriorly, and completely areolated, the 

 spiracles small, round; scutellum and postscutelluni laterally sharply 

 margined; ovijjositor somewhat shorter than the alidomen. 



(292) Aphnnoroptrwii Forster. 



6. Second joint of tarsi longer than the four following joints united 7 



Second joint of tarsi not longer than the four following joints united 8 



7. Second ri'current nervure uniting with the discoidal nervure before the very 



short transverse cubital-transverse median nervure in hind wings 

 broken above the middle; first abdominal segment narrow, almost 



three times as long as wide (293) Cryptvrus Gravenhorst. 



Second recurrent nervure uniting heJiind the transverse cul)itns; abdomen a 

 little longer than the head and thorax united, the petiole elongate. 



(294) £»«/(•(//« Towpiinet. 



s. Sfc( )n(\ recurrent nervure uniting beJiind the transverse cubitus 9 



Second recurrent nervure uniting before the transverse cubitus. 



Anterior and middle claws cleft before the middle, the hind claws simple, 

 the middle and hind tibije with 2 apical spurs; transverse median 

 nervure in liind wings l)roken at or a little above tlic middle: hind 

 legs nmch lengthened; ovipositor as long as the l)ody. 



(295) Arotes Gravenliorst. 



