ODYNERUS. 1ST 



the first segment preceded by a little stronger zone of punctures 

 and its suture a little more salient. Border of segments 2-4 

 sinuate in the middle. 



Inject black, clothed with yellowish hair. Mandibles and 

 clypeus yellow ; this last very finely bordered with black and 

 often offering on the summit a vertical black line. A line behind 

 the eyes, a spot on the front, and a little vertical line on their inner 

 border beneath the ocular sinus ; these are black. Anterior 

 border of the prothorax widely yellow ; the yellow often 

 encroaching upon the surface and extending along its hinder 

 borders. Tegulee, a spot beneath the wing, f,ost-scutel, two 

 spots on the scutel, yellow. Abdomen wholly yehow ; the ante- 

 rior face of the first segment black, as well as l. depression at the 

 base of the second and often a widened mark behind, on the first. 

 Legs yellow, coxae and femora black. Antenna! orange ; the 

 scape before yellow and the last third black, or obscure above. 

 Wings ferruginous, with the end gray. The markings are of a 

 sulphur-yellow. 



Var. Scape of the antenna? yellow with a black line above. 



% . Smaller. Clypeus yellow, bidentate. Antenna? large, 

 terminated by a small hook. Angles of prothorax very salient ; 

 border of 2d segment very rugose, more strongly reflexed ; 1st 

 and 2d segment with a great black square notch (variable), the 

 following segments black, bordered with yellow. Anus black. 



Bess. a. diff. — This Odyiierus may be almost considered as a 

 California variety of the 0. tuber culiceps, in which the red 

 markings have passed into yellow, all becoming reduced ; the 

 metathorax being black, etc. This insect presents, like the 0. 

 sulfureus and like the Californian Polistes, a striking example of 

 the local influence of California which tends to give to insects a 

 uniform sulphur-yellow color by the augmentation in extent of 

 the yellow ornaments and the reduction of the deeper color. 



Hub. California. I owe twenty individuals to the kindness of 

 Mr. Sutter and of Mr. Berton. 



28. A. pilosus Sauss. — Niger, longe nigro-pilosus, hirsutus ; pronoto 

 angulato, metanoto utriiique tenuissime bidentato; primi abdominis 

 segmenti sutnra in facie antica sita ; 2' segmenti margine valde punctato ; 

 puncto froutali, piouoti margine, fascia interrupta in scutello et in post- 



