AMERICAN HYMENOPTJERA. Yl 



niacrotera megacephala.— '£•— Head very large, transversely sub- 

 compressed, shining brown, finely punctured; face very broad, prominent 

 between antennae, the anterior margin truncate, clypeus small, short, coarsely 

 punctured, mandibles long, pale testaceous, fuscous at tips, a moderately deep 

 longitudinal groove on anterior orbits above the antennae which are short and 

 fuscous; thorax smaller than head, black, prothorax transversely compressed; 

 metathorax smooth and shining; tegulse pale testaceous; wings as in texana ; 

 legs brown, with short pale pubescence ; abdomen short ovate, subconvex, 

 shining, reddish-brown or ferruginous, apex with a few pale hairs, sides of 

 second and third segments with a submarginal groove; anal segment small, 

 quadrate, flattened, coarsely punctured. Length .26 — .^{O inch. 



Huh. — Texas, (Heiligbrodt). Three specimens. This mcay be the 

 % of texana. The head is very broad, and is larger in the specimen 

 with dark abdomen; otherwise there appears to be no difference 

 between them. 



Macrotera californica.— '^ .— Head and thorax blue, or greenish-blue, 

 thinly clothed with whitish pubescence; head broader than thorax; face broad, 

 a short indistinct groove on upper anterior orbits; clypeus broadly subtriangular, 

 the lateral corners reaching the base of mandibles, the apex deeply emarginate 

 for the labrum which is deeply foveate; broad lower margin of face, sometimes 

 a dot beneath insertion of each antenna, clypeus except two black points near 

 base, labrum and mandibles, except tips, white or yellowish white; antennae 

 pale testaceous beneath; mesothorax delicately punctured, with a finely im- 

 pressed longitudinal line on each side over tegulte : metathorax smooth, broadly 

 rounded; tegulae ))ale testaceous; wings hyaline, neuratiou much as in texana, 

 except that the marginal cell is shorter and squarely truncate at tip; legs black, 

 thinly clothed with pale pubescence, anterior tibiae in front and all the tarsi 

 testaceous; abdomen short, ovate, convex, shining, black, the segments rather 

 broadly margined at base and apex with dull testaceous, apex incurved, the 

 terminal segment short and broad, apical margin sinuate and having beneath 

 two divergent obtuse teeth. Length .25 inch. 



Hah. — California, (Edwards, Crotch). Three specimens. 



Macroteracephalotes.— '^.— Lemon-yellow, shining; head very large, 

 transversely quadrate, slightly emarginate above, and broadly truncate beneath, 

 middle of vertex longitudinally impressed, face very broad, clypeus exceedingly 

 small, tuberculiform, tinged with fulvous; labrum also very small; mandibles 

 large, broad at base, acute and simple at tip; a sinuate band from eye to eye at 

 summit, a punctiform dot just below on anterior orbits and tips of mandibles 



black; antennae ; thorax smaller than head; prothorax prominent, 



formed much as in the Sphegidae; a stripe on each side of prothorax, another 

 beneath wings, pleura beneath, and the metathorax" except two pale spots black 

 or bluish-black; wings whitish-hyaline, neuration as in preceding species; legs 

 entirely yellow; abdomen broadly ovate, nearly circular, flattened, smooth and 

 polished, base of first segment and a band near apical margin blackish, the re- 

 maining segments tinged with brownish on apical margins; apex acuminate. 

 Length .25 inch. 



Hah. — Nevada, (H. Edwards). One specimen. A very curiously 

 formed species. 



