AMERICAN HYMENOPTERA, 253 



triangular mark on the front touching the eyes, prosteruum, tegula-, tubercles, 

 base of pronotum and scutellum whitish yellow ; legs rufo-fulvous, the hind tarsi 

 fuscous, the 2nd joint white. Flagellum of anteunje dark fuscous. Wings 

 hyaline, the stigma and nervures blackish. % . Length 4 5 mm. 



Head, pro- and mesothorax smooth and shining; the metanotum between the 

 keels irregularly longitudinally striated; the apical slope tinged with yellow, 

 Irregularly, obscurely striated. Mesopleurse closely striated on the top at the 

 apex ; it is yellow there, and the mesosternum is for the greater part yellow ; its 

 base marked with black. Areolet minute, badly defined, open behind, where the 

 recurrent nervure is received. Head wider than the thorax, the temples roundly 

 narrowed. Parapsidal furrows distinct at the base only. Mctapleural keel dis- 

 tinct. Scutellum roundly convex, its sides not margined. The thorax is three 

 times longer than wide ; the metathorax moderately large, the basal keel distinct ; 

 the 2nd distinct in the middle only. Abdominal petiole long, slender, not much 

 dilated at the apex. Transverse median nervure in hind wings angularly 

 broken below the middle. 



Hab. — Mexico. 



This species does not look like a Mesostenas, but as it fits the 

 characters of that gentis, as given by Dr. Ash mead in his table 

 (Bull. U. S. Nat. Mus., XXIII, 44) and no where else, I leave it 

 in that genus. 



Mesosleiioidens fiilTipes sp. nov. 



Black, the face, clypeus, palpi, the eye orbits — the outer more broadly below — 

 a hue on the base and apex of the prothorax, a mark on the apex of the middle 

 lobe of mesonotum, scutellum, postscutellum, the keels, the sides of the apical 

 slopes of the metanotum, including the spines and extending on the metapleurse, 

 tubercles, a large mark, narrowed behind, on the lower part of the mesopleurse, 

 the greater part of the lower half of metapleurte — the line distinctly narrowed 

 towards the apex — and brown bands on the apices of all the abdominal .segments 

 yellow. Legs rufo-fulvous, the tibije and tarsi tinged with yellow, the 4 front 

 coxie and trochanters yellow. Wings clear hyaline, the stigma and nervures 

 black, f. Length 12 mm.; terebra 6 mm. 



Face and clypeus sparsely punctured. Mandibles and sides of clypeus (includ- 

 ing the fovese) black. Front at the lower ocellus striated ; below it is a short 

 keel. Mesonotum strongly but not closely punctured. Scutellum more sparsely 

 punctured ; the basal depression large, deep, with 2 keels in the centre. Base of 

 metanotum smooth, slightly sparsely punctured ; behind the keel strongly stria- 

 ted, except on the top of the apical slope; at the base of the keel, in the centre, 

 are 2 short, stout curved keels; the spines stout, rounded and narrowed at the 

 apex. Propleurse, except at the base, stoutly striated ; mesopleurse less strongly 

 striated above, the lower part punctured ; the metapleurse closely, strongly 

 obliquely striated. Abdomen smooth and shining. Areolet minute, narrowed 

 behind; the recurrent nervure received at its apex ; transverse median nervure 

 received distinctly behind the tranverse basal. 

 Hab. — Mexico. 



TRANS. AM. ENT. SOC. XXX. AUGUST. 1904. 



