AMERICAN HYMEN OPTERA. 379 



at the apex in the middle. Apical half of ventral keel roundly dilated. %. 

 Length 4.5 mm. 



This little species appears to run into Dr. Ashmead's genus 

 Dimorphomutilla. Cf. Canad. Ent., xxxv, 325. 



ICHNEUMONID^E. 



Agrypon flaviceps sp. nov. 



Luteous, the thorax paler, the head except the greater part of the front and 

 vertex pale lemon-yellow, the ocellar region hlackish ; legs colored like the 

 body, the four front coxae and trochanters pale yellow ; antennae fuscous, longer 

 than the body; wings short, clear hyaline, the nervures and stigma pale testa- 

 ceous. £, . Length 9; ovipositor 1 mm. 



Smooth, shining, thickly covered with short pubescence. Scutellum flat, 

 appearing almost depressed above. Base of metanotum areolated, the central 

 area elongated, dilated in the middle, the lateral basal area wider than long, 

 semicircular; the remainder irregularly reticulated, the reticulations wider than 

 long. The transverse median nervure is received shortly beyond the. transverse 

 basal; the disco-cubital nervure is not quite interstitial ; but the 3rd discoidal 

 cellule is pointed at the base ; the hind tibia?- are long, longer than their femora 

 or tarsi. The transverse cubital nervure is long; half the length of the recur- 

 rent nervure. 



This species agrees fairly well with the definitions given by 

 authors, except that the " trochanter is not or little longer than the 

 trochantellus " (cf. Schmeideknecht, Zeit. f. Hymen., 1902, p. 361), 

 but much longer than it, as in Atrometus. Neither the latter genus 

 uor Agrypon has been recorded, so far as I know, from America. 



This seems to be an Agrypon Foer., as defined by Dr. Ashmead 

 (Bull. U. S. Nat. Mus., xxiii, 89), it having the disco cubital 

 nervure interstitial with the discoidal, the 3rd discoidal cell being 

 therefore pointed at the base; and the hind tibiae are long; but 

 according to Schmiedeknecht (Zeit. f. Hym. ti. Dipter., i, 1902, 

 361) these are the characters of Atrometus Foer., as given by the 

 German author, the latter genus having also short tibiae, with the 

 basal joint of the trochanters only slightly longer than the apical ; 

 in Agrypon it is double the length of the 2nd, as it is in the species 

 I have described. There is certainly some confusion in the defini- 

 tions of the genera as given by the American and German authors. 



I translate Schmiedeknecht's diagnostic characters so that they 

 may be compared with Dr. Ashmead's : 



Parallel nervure not interstitial. Hind tibia? longish. Trochanter not or only 

 little longer than the trochantellus. Antennae somewhat of the 

 length of the body Agrypon Forst. 



Parallel nervure interstitial, the discoidal cellule narrowed to a point. Hind 

 tibia? short. Trochanter almost double the length of the trochantel- 

 lus. Small species Atrometus Foer. 



TRANS. AM. ENT. SOC. XXXI. OCTOBER, 1905. 



