160 AMERICAN HYMENOPTERA. 



30, on plant No. 21, which seems to be a Canna. All collected by 

 Prof. C. H. T. Townsend, 1896. 



Nearest to C. exhnia Sni., but larger, legs not ferruginous, etc. 



(25.) Ceratiiia naiitJaiia n. sp. % . — Leugth about 4.5 mm., shining dark 

 olive-green, strongly punctured ; clypeus entirely, labruin except a spot on upper 

 border, and an oblong spot on each side, a small spot on mandibles and the tuber- 

 cles cream color or pale cafe-au-lait ; small joints of tarsi more or less rufescent; 

 antennse piceous, flagellum not pale beneath ; tegulae shining, piceous. Wings 

 hyaline, slightly dusky toward the apex, nervures and stigma piceous; face 

 somewhat narrowed below, with very large punctures ; clypeus not punctured, 

 but irregularly grooved : mandibles bifid at tips ; a partly single, partly double 

 row of punctures just behind the eyes, behind which the cheeks are broadly 

 smooth and impunctate; base of metathorax dark bluish green, minutely irregu- 

 larly wrinkled, so as to seem granular; hind femora angled below, but hardly so 

 strongly even as in dupla ; there may be a well-developed pale stripe on anterior 

 tibia. 



9 . — Length 5 mm., similar to % ; clypeus with only an oblong pale mark, 

 labrum black; mandibles dark rufous medially, bifid as in % ; dark parts of 

 clypeus with large punctures ; cheeks with a triple row of punctures behind eyes, 

 then smooth. 



Hab.—San Rafael, Vera Cruz. The 9 ]March 12; the I March 

 9, two on Bidens (C. H. T. Townsend). The name of the species is 

 derived from the Rio Nautla, which runs by San Rafael. 



Near to C. strenua Sm., but differs in the dark tibiae, antennae, 

 tegulee and nervures. The punctuation of the cheeks is very char- 

 acteristic and distinguishes it at once from a very similar species 

 found in Nevv Mexico. 



(26.) E.YOiiialop!!iis sidie n. sp. 9- — Length 8 mm., rather stout, very 

 shiny. Head, thorax and legs black. Abdomen red ; face about square, orbits 

 parallel, vertex smooth and impunctured, clypeus rather obscurely punctured ; 

 face with sparse, appressed, white pubescence, a dense, suberect, brush of the 

 same just above the antennae ; vertex with a few erect hairs, which, in the speci- 

 men described, have entangled a mass of Sida pollen ; labrum with a fringe of 

 yellowish hairs; mandibles simple, grooved without, dark rufous medially; first 

 three joints of maxillary palpi conspicuously stouter than the other three; fla- 

 gellum dark brown beneath, funicle oval. Thorax sparsely punctured, nearly 

 nude, except lines or bands of white pubescence along hind margins of prothorax 

 and scutellum, and covering postscutellum, and similar pubescence on tubercles, 

 pleura, and more or less on sides of metathorax ; tegulse testaceous. Wings hya- 

 line ; stigma pale orange-brown, nervures fuscous, contrasting, costal nervure 

 black, second submarginal cell nearly square; venation as in E. solnui ; small 

 joints of tarsi rufous. I^egs with white pubescence ; the abundant scopa of hind 

 legs pale fuscous, very strongly plumose, carrying an enormous quantity of the 

 pale yellow pollen of the Sida. Abdomen pyriform, almost impunctate. rufous; 

 first two segments bare and shining, except a patch of appressed white pubes- 

 cence on each side, and erect white hairs at base of first; third and fourth seg- 



