1865.] 59 



This anomalous genus is readily recognized by the narrow wings, 

 and the elongate fusiformly-clubbed abdomen, the basal segment of 

 which is slender and as long, or nearly as long, as the remaining seg- 

 ments which are broadly fusiform. 



I am, at present, unable to define the true position of this remarka- 

 ble genus. It seems to form a connecting link between the Ichneumones 

 genuini and the adsciti; from the former it differs by the paucity of 

 the antennal joints, and from the latter by the anterior wings having a 

 faint indication of a second recurrent nervure. Its structure places it, 

 beyond doubt, in the family Ichneumonidfe, while its general appear- 

 ance, together with the arrangement of the wing-veins, seems to place 

 it among the Adsciti, where I will allow it to remain for the present. 



Rhopalosoma Poeyi. n. sp. 



% 9 . — Entirely of a uniform pale honey -yellow, smooth and polished ; 

 tips of the mandibles black; vertex, and the apex of the abdomen more 

 or less dusky, especially in the % , and in one % specimen the metatho- 

 rax and abdomen are almost entirely tinged with dusky ; tarsal claws 

 dusky ; wings hyaline, slightly iridescent, nervures pale fuscous. Length, 

 9 6 lines, % 4A lines; expanse of wings, 9 8J lines, % i)\ lines. 



Collection. — Ent. Soc. Philad. and Dr. J. Gundlach. Three 9 , two 

 % specimens. 



It gives me much pleasure to dedicate this singular insect to Prof. 

 Felipe Poey, to whom I am greatly indebted for much valuable infor- 

 mation regarding the habits of many Cuban Hymenoptera. 



CHAONIA, nov. gen. 

 Head transverse; face flat, broad; eyes large, prominent, rounded; 

 ocelli large and prominent; clypeus moderate, slightly prominent, 

 rounded at base and truncate at tip ; mandibles small, bifid and acute 

 at tip; palpi very long and slender. Antennse, distant, inserted high up 

 on the front close to the eyes, long and thread-like, multiarticulate, the 

 basal joint moderately long and robust, the second minute, the other 

 joints indistinct and finely pubescent. Thorax gibbous, rather short, 

 deep, compressed, narrowed in front; mesothorax with the lobes very 

 prominent; sides of the prothorax with a broad, longitudinal, shallow 

 groove ; pleura large, very protuberant beneath between the four ante- 

 rior coxse, and divided by a more or less deep longitudinal sulcus; scu- 

 tellum elongate, rather prominent; metathorax moderate, somewhat 

 rounded above, obtuse behind. Wings long and rather narrow; stigma 

 large and sublanceolate ; marginal cell large, elongate, broad at base 

 and gradually tapering to the tip of the wing; two submarginal cells. 



