75 
of New Exotic Aculeate Hymcnoptera. 
Division 1. (Pison, Jurine, <^c.) 
The recurrent nervures either interstitial or both received by the 
second submarginal cell. 
Species 1. Pison ater, Spin. 
Ater, subpubescens, vage punctatus ; alis hyalinis, apice obscuris, ner- 
vis nigris. 
Long. 4 lin. 
Alyson ater. Spin. Insect. Lig. fasc. 4, p. 253. 
Pison Jurini. Ib. 256 ; St. Fargeau et Serville, Ency. Meth. x. 
143, 1. 
Tachybulus niger. Latr. Gen. Crust, et Insect, vol. iv. p. 75. 
Pison ater. Latr. ib. 387. 
Obs. — I have been obliged to construct the best specific diagnostic 
that I could contrive for this species, as I do not possess it, nor do 
I know any cabinet in London in which it is to be found Spinola’s, 
Latreille's and St. Fargeau’s descriptions contain no character be- 
yond colour, which is not common to all the species, and conse- 
quently generic. 
Species 2. Pison xanthopus, Bridle. 
Niger ; thorace tenuissimc punctato, metathorace oblique striato ; capite 
anterius aureo-villoso ; mandibulis, palpis, tarsisque saturate, ab- 
dominis apice obscure, rufs ; segmentis 3 primis margine argenteo- 
pilosis ; alis hyalinis, apice nervisque fuscis. 
Long. 4 lin. 
Nephridia xanthopus. Brulle, Annales de la Soc. Ent. de France, 
vol. ii. p. 403. 
Species 3. Pison obscurus, Shuck. 
Niger, tenuissime punctatus ; metathorace oblique striato ; cdis fuscis, 
nervis tegulisque testaceis. $ , $ . 
Length 4 — 5\ lines. 
Entirely black, delicately punctured ; the apex of the antennse 
and mandibles rufo-piceous ; the face and clypeus covered with a 
golden down, which extends as high as the emargination of the 
eyes. The tegulse of the wings testaceous, the wings fuscous, their 
nervures testaceous; the extreme joints only of the tarsi piceous, 
and the tibiae and tarsi without spines or ciliae. 
The abdomen has the margins of the first, second, and third seg- 
ments much depressed and covered with a dense silvery down. j. 
The $ differs in having more joints of the tarsi rufo-piceous, as 
well as the knees and the margin of the fourth, fifth, and sixth seg- 
