WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. l6l 



parapsidal grooves almost obsolete, the space behind the wings 

 about as long as that before them. Scutel subquadrate, flattish. 

 Metathorax subcubical, its sides a little convergent behind, the 

 carinate areas generally, except the posterior one, all distinct. 

 Abdomen subpetiolated, elongate-clav^te d*, clavate ?, d* $ with 

 their sides nearly straight to beyond the middle, the tip of joint 5 

 c?, joint 6 $ , being about the widest part. Joint i c? $ very long ; 

 joint 2 longer than wide ; 3-6 d* nearly square ; 3-7 $ shorter than 

 long and subequal. Venter imusally corneous, flattened, and with 

 a slight longitudinal carina ; anus $ slit, as it is termed. Ovi- 

 positor about as long as the abdomen ; sheaths moderate, not ta- 

 pered. Legs moderate ; in all 6 legs $ tarsal joints 3 and 4 very 

 short, and joint 3 acutely bilobate ; in the middle legs ? tarsal 

 joint 2 likewise short, and the tibize twisted as in Odontomerus ? ; 

 in all 6 tarsi ^ only joint 4 very short, and all the joints simple. 

 Both front and middle tibiae ? inflated near their tip. Hind coxae 

 d* ? long and slender, and about as long and stout as the femora. 

 Spurs normal. Claws simple, moderately long, much longer than 

 the pulvillus. Wings moderate. Stigma and radial area elon- 

 gate. Areolet large, rhomboidal, its anterior angle often more 

 or less truncate. The ist recurrent vein almost straight ; the 2d 

 recurrent vein biangulated. Bullae 4, B, C, D, and E ; B on the 

 posterior end of its vein, C close to the areolet, D between the 

 two angles of its vein, and E nearer to the tip than to the base of 

 its vein. 



Closely allied to Xorides, Grav., by its face narrowed below^ 

 and to Odontomerus by the singularly twisted middle tibia 2, 

 which character is here subobsoletely shown also in the front ti- 

 biae 2. Differs from all the other genera belonging to this group, 

 except certain Echthrus, viz., annulicornis, n. sp., and ornatipennis^ 

 Cress., by the obsolete parapsidal grooves and the large areolet.. 

 From Echthrus it is at once separated by the emarginate eyes, the 

 long clypeus, the singular structure of $ legs, and the separation 

 of bullae C and D. The abdomen d" is not greatly elongate and 

 almost linear, as in Xorides d* and Xylonomus d*, nor has it the 

 tips of its joints emarginate as in Xorides d". Brull6 entirely over- 

 looked some of the most remarkable characters of this genus, e.g» 

 the face narrowed in front, the subcubical head, and the bilobate 

 1 3d tarsal joint $, and confounded it with Mesochorus, Grav.» 

 which appertains to an entirely different group, and has a trans- 



Jii — II Dane 9, 1873.] 



