64 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiii. 



6. Face and scutelluni normal Tribe II. Cteniscini (part). 



Face sc'utatiform ; scutelluni cjuadrangular, margined laterally; abdomen lontr, 

 sessile, the sides i>arallel or nearly, coarsely punctate; areoiet in 

 front wings usually large, lozengoidal, or diamond-shaiied. 



Tribe X. Metopiini. 



Tribe I. MESOLEPTINI. 



1855. Tnjplum'uh'ii Jiomalopi Holmgren (part), Kongl. Svensk. Vet.-Akad. Hand!., 



I, p. 98. 

 1868. Mesoleptoldtc, Family 35, Fokstek, Verb. d. naturh. Ver. pr. Rbeinl., XXV, 



pp. 34 and 197. 

 1883. Mesoleptina, Tribus, Thomson (part), Opus. Ent., IX, pp. 876 and 906. 

 1894. Mcsoleplini, Tribe I, Ashmead, Proc. Ent. Soc. AVash., Ill, p. 277. 

 1897. Mesoleptini, Tribe, D.wis, Trans. Am. Ent. Soc, XXIV, j). 300. 

 1900. Mesoleptini, Tribe I, Asiimead, Smith's Insects of New Jersey, p. 575. 



In havino- a distinctly petiolated abdomen this tribe agrees with 

 IchneiLriionlnce^ Crypt'nin'^ and some in the Ophioninivj from all, how- 

 ever, excepting- some in the last mentioned, it is at once separated by 

 the straight, not elbowed petiole, and by the position of the spiracles, 

 which arc placed at or hcfore the middle, never behind, while from the 

 few genera in the Opli'wnlnm having the spiracles similarly situated, it 

 is readily distinguished by the non-compressed abdomen, and by the 

 abdomen in the males not terminating in two long spines. 



The only group in the subfamily Tryphonina'^ with which it could 

 be confused, if the other characters made use of in my table are taken 

 into consideration, is the tribe Ctenopelinini^ but from this tribe it is 

 separated l)y the simple, not pectinate, claws. 



Thirty -six genera have been recognized, distinguishable by charac- 

 ters made use of in the following table: 



table of genera. 



Head transverse, the temples not broad, scarcely half as wide as the width of the 

 eyes 6 



Head quadrate, the temples broad, fully as broad as the width of the eyes. 



The longer spur of hind tibise as long as or longer than the second joint of 

 tarsi 3 



The longer spur of hind tibiae shorter than the second joint of tarsi. 



Front wings vuili an areoiet 2 



Front wings v:ilhout an areoiet (418) Spanotecnus Forster. 



2. Transverse median nervure in hind wings broken below the middle; metanotum 



incompletely areolated (419) Ed[/tus Holmgren. 



Transverse median nervure in hind wings broken above the middle; metanotum 

 completely areolated (420) Ichnaops Forster. 



3. First re(;urrent nervure, or the disco-cubital nervure no< angularly broken ; head 



not imusually" swollen 4 



First recurrent nervure, or the disco-cubital nervure angularly broken; head 

 very much swollen, tlie vertex jiosteriorly deeply emarginate. 



(421) Pobjoncns Forster. 



4. Stigma broad; first joint of the llagellum not longer than the second; metatho- 



racic spiracles round, and not lying nearer the external area than 



