loooH 
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, flattislu 
Metathorax subcubical, its sides a little convergent behind, the 
carinate areas generally, except the posterior one, all distinct. 
Abdomen subpetiolated, elongate-clavate d, clavate 2 , c? 2 with 
their sides nearly straight to beyond the middle, the tip of joint 5 
c?, joint 6 2 , being about the widest part. Joint 1 d 1 ? very long ^ 
joint 2 longer than wide ; 3-6 d' nearly square ; 3-7 2 shorter thaiK 
long and subequal. Venter unusally corneous, flattened, and with’ 
a slight longitudinal carina; anus 2 slit, as it is termed. Ovi¬ 
positor about as long as the abdomen ; sheaths moderate, not ta¬ 
pered. Legs moderate ; in all 6 legs 2 tarsal joints 3 and 4 very 
short, and joint 3 acutely bilobate; in the middle legs 2 tarsal 
joint 2 likewise short, and the tibiae twisted as in Odontomerus 2 
in all 6 tarsi c? only joint 4 very short, and all the joints simple. 
Both front and middle tibiae 2 inflated near their tip. Hind coxae 
c? 2 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 1st 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 tibiae 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 2 legs, and the separation^ 
of bullae C and D. The abdomen c? is not greatly elongate and, 
almost linear, as in Xorides c? and Xylonomus cT, nor has it the 
tips of its joints emarginate as in Xorides d*. Brull£ 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- 
3d tarsal joint 2 , and confounded it with Mesochorus , Grav., 
which appertains to an entirely different group, and has a trana- 
iii—U [June 9,1S73.] 
Missouri Botanical Garden 
George Engelmann Papers 
Botanical 
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