WALSH DESCRIPTIONS OF N. AM. HYMENOPTERA. 151 



sexual character in Ichneumonuia, and consequently his c? is pro- 

 bably a distinct species [belonging to the genus Mesostenus^ Grav. 

 — Cresson]. 



Arotes [am(Bnus, Cress.] — c?. — Differs from the above $ only as fol- 

 lows : — I. The face, including the 2 foveae, is white immaculate, and the 

 orbits are not at all interrupted below. 2. The antennae are full as long as 

 the body, the scapus and the base of the flagellum whitish below; and the 

 flagellum white from about joint 15 or t6 to the last joint or two, which are 

 brown. Joint i of the flagellum only ik times as long as wide. 3. The hind 

 angles of the lateral carinate areas of the metathorax are prolonged into a 

 short, robust, blunt thorn directed upwards and backwards. 4. The whole 

 pleura of the collare, except an abbreviated black line on its hind margin, 

 is white. The white spot covering the hind i of the metanotum extends 

 forwards so as to cover the central area and the hind i of the basal area; 

 and the broad abbreviated band on the front edge of the mesothoracic 

 pleura is absent, except the curvee branch of it that occupies the disk of 

 the pleura. 5. Abdominal joint i is 4^ timer long as wide, scarcely twice 

 as wide at tip as at base, its sides nearly straight except that the tubercle 

 is very large and prominent in the middle, and the extreme base is a little 

 ■widened. The carinae are further represented by a shallow, longitudinal 

 excavation extending from opposite the tubercle nearly to the tip. Joint 2 

 slightly longer than wide. 6. Besides the terminal white band on joint i, 

 there is a dorsal white vitta extending \ of the way to the tip, and it is only 

 on joint i that the terminal white band does not quite attain the extreme 

 tip. 7. The 6th ventral, of course, i§ small, and, as well as the 7th, white ; 

 the 8th is black. 8. The legs are white ; the hind legs with their coxae 

 superiorly and on their extreme base black ; their femora and tibiae, ex- 

 cept the knees, superiorly black. 9. The basal \ of the stigma is white. 

 Length ^ .46 inch. Front wing c? .41 inch. 



One d*, found dead, but uninjured, in an oak stump ; 2 un- 

 known to me. Differs from the 9 described by Say as decorus, in 

 the mandibles not being basally black ; in the antennae being sub- 

 terminally white, instead of having a white postmedian annulus 

 ^f about 8 joints ; in the scutel not having a black disk ; in the 

 pectus not being "pale honey-yellow"; in the ist and 2d abdomi- 

 nal joints being differently marked ; in the legs being white, not 

 honey-yellow ; and in the hind femora and tibiae being vittate 

 above with black. In the metathoracic thorns it agrees with it. 



ACCENITES, Gravenhorst (= ^ca«//»5, Latreille) . 



In this genus, which is readily distinguishable from Arotes not 

 only by its very robust legs and antennae, but by the cubito-dis- 

 coidal cell receiving only the i st recurrent vein ; there are 3 very 



