98 TRANS. ST. LOUIS ACAD. SCIENCE. 



coarsely and longitudinally rugose; the remainder of the abdomen, ex- 

 cept a few minute rugae at the base of joint 3, glabrous and polished. 

 Joint I twice as long as wide, i wider behind than before, its sides slightly 

 convergent J of the way from the tip to the base, thence parallel nearly 

 to the base, where they converge rapidly but in a regular curve without any 

 angle or tooth ; carinae distinct, but not lofty or acute, all the way to the 

 tip, and enclosing between them a shallow excavation. Joint 2 longer by 

 i than wide ; 3 nearly as long as 2 ; the rest rapidly shorter and shorter. 

 Extreme tips of 1-4 rufo-piceous. Venter luteous on the basal §. Leg's 

 pale dull rufous; the 4 front ones honey-yellow. Wings hyaline; veins 

 brown ; stigma pale dusky, twice as long as wide. Radial area with a pos- 

 terior angle of 90°. Areolet pentagonal, its sides converging a little as 

 they approach the radial area, the 2d recurrent vein entering it rather 

 nearer to its tip than to its base. Length c?? .13 inch. Front wing (^l 

 .12 inch. 



One ^ ; ? unknown to me. Distinct by the shape of its areo- 

 let from all the Exochus described by Mr. Cresson that have any 

 areolet at all, viz. apicalis and fulvipes^pygmceus. 



POLYRHABDUS, new genus. 



Antennae rather robust, with the first joint of the scapus square- 

 ly truncate and joint 2 large ; first joint of the flagellum short 

 and the following joints almost square. Face and cheeks prom- 

 inent as in Exochus. Scutel flattened and laterally and termi- 

 nally carinate. Abdomen sessile ; joint i with about 5 distinct 

 longitudinal carinag on its dorsal surface, joint 2 with 3, and joints 

 3 and 4 with i only. Venter much excavated. Ovipositor very 

 short. Legs short and robust ; femora incrassate ; tarsal claws 

 moderately long and simple ; pulvillus as long as the claws. Wings 

 shorter than usual. Areolet obsolete. Areolar cross-vein as long 

 as usual. Bullae 2, located as in Exochus^ except that E is pretty 

 close to the angle of its vein. 



Distinct from Exochus by its carinate abdomen, its excavated 

 venter and its short wings ; and from Alomya by its sessile abdo- 

 men, obsolete areolet, the distinctness of its terminal wing-veins, 

 its prothorax not prolonged in front, anti its hind femora being 

 more incrassate than the 4 front ones instead of vice versa. 



Polyrhabdns cariniger, n. sp.— $.— Black.— /^ccrf opaque, with very 

 fine, dense punctures and pubescence, sparse on the subpolished vertex. 

 Face projecting beyond the eyes f of their shorter diameter, pale yellow 

 above and laterally, rufous on the disk and as far as the clypeus ; the ter- 

 minal foveae, and a small, flat tubercle on its upper disk, fuscous. Clypeus 

 and mandibles, except their tips, rufous. Palpi whitish. Antennae brown- 



