314 [September 



the pleura and a Hue on each side of the pectus, white ; scutelhim 

 polished, with a large white spot covering almost its entire surfiice. be- 

 hiild it a small transverse spot; metathorax finely scabrous, opaque^ 

 the anterior carina well defined, the lateral tubercles prominent but 

 obtuse, on each side posteriorly a large oval white spot covering the 

 tubercles. Wings hyaline ; nervures and stigma black ; areolet larger 

 than usual, quadrate. Legs pale fulvous, the anterior and middle coxae, 

 a large spot on the posterior coxae, an annulus near the base of their 

 tibiae and their tarsi, except extreme base and apex which are black, 

 white ; rest of posterior coxae and tibiae and the extreme tips of their 

 femora black. Abdomen robust, ovate, shining, black, densely and 

 finely punctured ; basal segment about as long as the second, stout, the 

 apex broad, convex and rather deeply punctured, petiole short and ro- 

 bust, flattened and polished ; apical margins of all the segments white, 

 those of the three basal segments broad ; apical segments polished ; 

 ovipositor short, scarcely half the length of the abdomen, rufo-piceous, 

 valves black. Length 5 lines ; expanse of wings 9 lines. 



Hab. — Pennsylvania. Mr. George Newman. 



More robust than Al. albojjictuSjVfith the posterior legs much shorter. 

 The ornamentation is, however, very different. 



3. Mesostenus thoracicus. n. sp. 



Yellowish-rufous ; head, antennae, mesothorax and pectus, black, with white 

 lines; antennse with abroad white annulus; ovipositor as long as the abdo- 

 men ; posterior tarsi % , white. 



Female. — Head black; orbits, interrupted behind and broad on the 

 cheeks, a large spot on the face just beneath the antennae sometimes 

 confluent on each side with the orbits, the clypeus, labrum, s])0t on 

 mandibles, and the palpi, white; antennae nearly as long as the body, 

 black, the 8th to 13th joints white. Thorax : mesothorax and pectus 

 black, densely and deeply punctured, the dorsal lines deeply impressed; 

 the collar above, tegulae, a broad sutural line before and a short line 

 beneath the wings, and an oblique line on each side of the pectus, 

 white; pleura yellowish-rufous; scutellum, subcouvex, shining, black, 

 its lateral margins and the carina on each side which connects it with 

 the mesothorax, white, having the appearance of a V ; postscutellum 

 also black, with a white spot beneath the scutellum ; metathorax densely 

 punctured, slightly pubescent, shining, entirely yellowish-rufous, rather 



