1865.] 



441 



stigma on the anterior wings. The small specimen has the neuration 

 of the anterior wings remarkably variable; on the left wing the third 

 submarginal cell is very narrow and transverse, while on the right 

 wing it is obliterated and thrown into the second submarginal, making 

 that cell nearly as large as the first; the marginal cell in both wings is 

 narrower than in the large specimen, and merely margins the stigma. 



21. Mutilla glabrella, n. sp. 



Dark honey -yellow, smooth and shining, thinly pubescent; head black; 

 wings hyaline, with a very short marginal, and three submarginal cells. 



Male. — Uniform obscure honey-yellow, very smooth and polished, 

 clothed with a thin, pale yellowish pubescence; head black, with fine 

 scattered punctures; eyes very large and prominent, entire and round- 

 ed; ocelli also large and prominent; clypeus and mandibles obscure 

 houey-yellow, the former very transverse and much depressed ; the 

 mandibles large, broad, the upper margin sinuate and acutely carinate, 

 the apex with three short, obtuse, blackish teeth ; antennae longer than 

 the head and thorax, filiform. Thorax rather broad in front, with thin, 

 subappressed, yellowish-sericeous pubescence; prothorax sunken, not 

 prominent; mesothorax large, rather broadly margined anteriorly, and 

 on each side over the tegulae a finely impressed longitudinal line, the 

 surface polished, with a few scattered delicate punctures; scutellum 

 smooth, with a few long pale hairs ; pleura rather closely punctured, 

 very prominent on the sides and beneath, and behind it a very deep 

 oblique excavation ; metathorax very finely sculptured, subopaque, sub- 

 quadrate, abrupt on the sides and behind, with a long, thin, pale pubes- 

 cence. Wings ample, hyaline; nervures fuscous, stigma moderate, 

 blackish ; marginal cell very short, scarcely more than half the length 

 of the stigma, the apex appendiculated and subacute, the lower nervure 

 more robust than the upper ; three distinct submarginal cells, the 

 first as long as the stigma, much narrowed at tip; the second small, 

 triangular, receiving the first recurrent nervure near the base, which 

 is pointed ; the third submarginal rather large, quadrate, and receiving 

 the second recurrent nervure about the centre. Legs color of the body, 

 thinly pubescent, the tibiae and tarsi paler. Abdomen elongate-ovate, 

 pointed at apex, petiolated, clothed with a long yellowish pubescence, 

 more dense towards the apex ; first or petiole segment very slender at 

 base and greatly swollen behind the middle and subglobose ; posterior 

 margins of the segments depressed or broadly margined. Length 5 

 lines ; expanse of wings 8 lines. 



One specimen. Closely allied in form and color to M. nubecula, but 

 may be at once distinguished from that species by the smoother sur- 



