1865.] 3 



more or less broadly black, that on the 6th segment broad and strongly 

 sinuate anteriorly, that on the 7th segment broadly and deeply indented 

 in the middle; apical margins of the 3rd and 4th segments slightly 

 dusky; apical segment large, dull ferruginous, broadly concave on the 

 disk above, the tip pointed and rugose, and the extreme sides blackish ; 

 ovipositor not exserted, sheaths dull testaceous. Length 10 lines; ex- 

 panse of wings 16 lines. 



Collection. — Ent. Soc. Philad. One specimen. 



The neuration of the anterior wing of this fine species is similar to 

 that of the following, but the right wing has two submarginal cells of 

 which the 2nd is one-third shorter, and the 2nd discoidal cell is shorter 

 and more quadrate than in that species ; while the left wing has but 

 one long submarginal cell, as in the typical Tremex, the dividing ner- 

 vure being entirely obliterated. Both this and the following species 

 seem to be intermediate between Urocerus and Tremex, the neuration 

 of the wings differing from both genera. 



Tremex latitarsus, n. sp. 



% . Head, thorax and legs blue-black ; abdomen ferruginous : wings fusco-hy- 

 aline; hind legs broad and flat. 



Male. — Head roughly punctured, blue-black, clothed with an erect 

 pale yellowish pubescence, much longer on the cheeks beneath ; the 

 vertex, posterior margin of the cheeks and the mouth, tinged with dull 

 rufous ; eyes oval and pale yellowish ; antennae a little longer than the 

 Fig. l. head, 5-jointed,* (Fig. 1, «) the first joint 



^H!!S3= rather long and slightly curved, second joint 

 _V^"C-^ : ^3- very small, about as long as broad, third ra- 

 ther more than twice as long as the second, 

 <^\ fourth joint about same length as the first 



c \\x ^vx. and rather longer than the second and third 



a y- together, the apical joint as long as the se- 

 cond, third and fourth together, very slightly curved and flat and some- 

 what twisted on the inside, the joints have a slight pubescence, espe- 

 cially at the incisures. Thorax thinly clothed with an erect pale 



*Or possibly 6-jointed, as the apical joint, examined under a powerful lens, 

 has. exteriorly, a very faint indication of a suture about the middle, but on the 

 inside there is no appearance whatever of a suture; in other individuals, this 

 indication of a suture maybe more distinct, but I care not to be positive of there 

 being more than 5 joints, although Westvvood mentions that in the case of Uro- 

 cerus gigas, the two apical joints of the antennae are "closely soldered together." 

 {Intr. II, p 114, note +.) It seems very remarkable, however, that there should 

 be only 5, or even 6, joints in the antennae, as Westwood, speaking of the whole 

 family Uroceridse, limits the number of joints from 10 to 25 (ibid. p. 114). 



