ODYNERUS. 189 



tions. A spot on the front, one behind the eye, a little line in 

 the middle of the prothorax, yellow. Tegulae black, bordered 

 with brown. All the segments of the abdomen regularly margined 

 with yellow; the first carrying but one narrow yellow band; the 

 second widely bordered. Legs black, knees, tibiae, and tarsi 

 varied with ferruginous. Wings washed with yellowish, with the 

 end grayish. 



%. Clypeus yellow, wider than long, notched in a half circle 

 and strongly bidentate ; its teeth quite removed. Labrum and 

 mandibles yellow. Antennae black, terminated by a little hook, 

 ferruginous beneath, with a yellow line on the scape. 



Bess. a. diff. — A species very distinct by its form, by the 

 angular suture of the first segment and by the very deep flutings 

 of the second; by its slightly sessile abdomen and its watery 

 reflections. By its velvety reflections, this species recalls the 0. 

 Parredesi, but its forms are entirely different. 



Hob. The temperate regions of Mexico. I took two males 

 about Yautepec in the south of the province of Mexico. 



Division STENANCISTROCERUS. 



Saussure Vespides, I, Sect. 1, c, p. 140 ; III, Sec. 2, p. 129. 



Form lengthened; body slender and cylindrical, rather than 

 depressed. Prothorax little retracted or none, angulate ; 

 abdomen cylindrical or campanulate, often little sessile. 

 First segment bell-shaped, rounded before, or cupuliform, 

 or in the form of a truncate or subpediculate bell; often 

 lengthened, its two faces frequently not being distinctly 

 separated, but passing from one to the other conve.xly ; the 

 suture variable, often irregular, either a little salient or 

 followed by a transverse fluting, often placed on the anterior 

 face. The whole insect strongly punctured ; the abdomen 

 in most cases coarsely punctured. 



The insects of this division are remarkable by their elonga- 

 tion, and by their cylindrical or compressed form. The clypeus 

 is generally narrower than in the Ancistrocerus, properly 

 speaking. The thorax is arched above, cribrose with great punc- 

 tures, and the grooves of the mesothorax, in general, wholly 

 wanting. The tegula? are large and closely fitted, containing the 

 arch of the back, and behind these one sees an apophyse or 



