MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPIDiE. 81 



scarcely visible fi^oiu above, or very loug, and separated from the me- 

 sonotuni by a strong constriction; mesonotnm not longer than wide, 

 with or withont distinct parapsides; sc^telluni generally large, rounded 

 or truncate posteriinily, entirely wanting only in Gonatopus; metatho- 

 rax quadrate or subquadrate, truncate or rounded off behind. Front 

 wings with a lanceolate or ovate stigma, a closed costal cell, two basal 

 cells, and an open radial cell; rarely with a distinct discoidal cell; 

 hind wings distinctly lobed, veinless except along the costa to two- 

 thirds its length, the tip of this vein being furnished with booklets. 

 Abdomen subpetiolate or petiolate, ovate or oblong-oval, depressed, or 

 occasionally compressed, composed of 8 segments, the ovipositor not 

 exserted. Legs long, the anterior femora much swollen, the miildle and 

 posterior pairs obclavate, the tibiae subdavate, their spurs 1, 1, i^ ^arsi 

 5 Jointed; the anterior tarsi in the females in all the genera, exc( ^^ 

 AphelopKs and Mystrophorus, are chelate. 



A very interesting group, and evidently an ancient phylogenetic type 

 of the order, the chelate anterior tarsi in the females being found in 

 no other group among the Hymenoptera. 



The l)r//j/«/wa' confine their attacks to homopterous insects belong- 

 ing principally to the families Fulgorida', Membracid.e and Jassidje, 

 living in felt like sacks protruding from the abdominal spiracles. 



Prof. Joseph Mik has given a most interesting account of the biology 

 of Gonotopus pilosus Tlioms., living on Beltoeephahis xanthoneurus, 

 while G. pcdestris Dalm. has been reared from Athysanufi mnritimioi 

 and Thamnotetttx' sulphurella. ApJielopus melaleurus Dalm. has been 

 discovered by Giard, in France, to prey upon Typhlovyba hippocastani 

 and T. dnuglasi. The genus Laheo Haliday, known only in the male 

 sex, bears a superficial resemblance to Aphclopus and has similar habits, 

 my Lalteo typlilocyb(V having been reared by Dr. Riley from a Typhlo- 

 cyha living on tlu^ sycamore. I believe this genus will yet i)rove to be 

 the opposite sex of Gonntopns. 



The following table will be foau<l all that is necessary to recognize 

 the genera : 



TABLE OF CJENERA. 



FEMAU5S. 



1. Vortex convex, not impressed 2 



Vertex deeply impressed; prothorax very long; anterior tarsi chelate. 



Wingless, without a sctitellum (Jonah u-i's Ljungh. 



Winged, with a scutellum DKYiNCsLatr. 



2. Stigma oval or ovate 3 



Stigma lanceolate; anterior tarsi chelate. 



Prothorax not (jnite as long as the niosonotnni, mnch contracted ; fourth joint 

 of anterior tars- r.)t nmch longer than the third, the first twice as 

 long as the thr« » folhviug united; maxillary palpi 4-jointed. 



JJoccnus Ashm. gen. nov. 

 21899— No. 45 



