ASHMEAD : CLASSIFICATION OF THE CHALCID FLIES 245 



Abdomen distinctly petiolate, the petiole the length of the metathorax, the body short, elliptical, 

 not compressed, shorter than the thorax ; scutellum without a cross-furrow before tip. 



Odopoia Walker (type 0. atra Walker). 

 Abdomen subsessile, the body elongate, snbcompressed, the length of the thorax ; scutellum ivith 



a cross-furrow before apex Bootania Dalla Torre (type Mefamorpha leucospoides Walker). 



2. Head seen ft-om in front a little wider than long, the ocelli placed in a slight curved line ; scutellum 

 with a cross-furrow before apex Megastigmus Dalman (type Ichneumon dorsalis Fabricius. 



Subfamily VI. Ormyein^. 

 1856. Ormyroidse, Familie X., Forster, Hym. Stud., II., pp. 19, 22 and 24. 

 1875. Ormyrides, Subtribiis, Thomson, Skand. Hym., IV., p. 100. 

 1899. Ormyrinse, Subfamily V., Ashmead, Proc. Eiit. Soc. Wash., IV., p. 247. 



Dr. Arnold Forster was the first to separate this group from other Torymids. 

 It is a ver}'^ distinct and compact subfamily, agreeing with the subfamily Toryminx 

 in venation and in pleural and pedal characters, but otherwise it is totally different 

 from it and the others. The females are easily recognized by the elongate, pointed, 

 orconically produced abdomen, non-prominent ovipositor, and by its peculiar sculp- 

 ture ; the males by the oblong oval shape of the abdomen, as well as by the sculpture. 



It shows some affinity with the Enrytomidie, and particularly with my tribe 

 Rileyini, in the shape of the pronotum, and in antennal and abdominal peculiarities. 



All are bred from hymenopterous and dipterous gall-insects, belonging princi- 

 pally to the families Cynipidas and Cecidomyiidse ; only a few species have been 

 described. 



Only three genera are known distinguished as follows : 



TABLE OF GENERA. 



1. Males ; abdomen oblong, depressed 4 



Females ; abdomen long, conically pointed and more or less compressed, especially towards the apex, 



the ovipositor never prominent 2 



2. Abdomen ivithout a peculiar sculpture, normal 3 



Abdomen with a peculiar sculpture, and some of the segments with two rows of jjits or deep punctures. 



No large, coarse punctures at base of middle abdominal segments ; antennae with 07ie ring- 

 joint Monobaeus Forster (type M. cingulatus Forst.). 



With large, coarse punctures at base of middle abdominal segments ; antennse with two ring- 

 joints Ormyrus Westwood (type 0. puncliger Westw.). 



3. Abdomen finely punctate ; antennae with </»-ee ring-joints. Tribaeus Forster (type T. j3M?ic<MZa/«s Forst.). 



4. Abdomen without a peculiar sculpture 5 



Abdomen with a peculiar sculpture. 



Antennae with one ring-joint Monobaeus Forster. 



Antennae with two ring-joints Ormyrus Westwood. 



5. Antennae with three ring-joints Tribaeus Forster. 



