124 POMONA JOURNAL OF ENTOMOLOGY 



A longish insect, narrow compared with the width, the thorax more than 

 twice longer than wide, the base narrowed transverse, the sides distinctly pro- 

 jecting. Parapsidal furrows complete, but shallow. Scutellum with a distinct 

 furrow down the apical three-fourths. Apex of postscutellum rounded, almost 

 transverse. Metanotum furrowed down the center, the furrow widened below, 

 keeled stoutly in the middle, the sides with a distinct edge. Propleurae punc- 

 tured above, the rest strongly closely striated ; mesopleurae with scattered 

 punctures, the apex above closely rugosely punctured ; metapleurae obscurely 

 finely striated at the apex. First abdominal segment distinctly longer than 

 it is wide at the apex, without a distinct neck at the base, it is narrower than 

 the second which is clearly longer than wide, and is narrowed at the base, 

 smooth and shining. Clypeus pyriform, shining, weakly sparsely punctured, 

 its apex with a wide shallow incision. The transverse keel on the base of the 

 abdomen is weak, the apical longitudinal furrow deep and clearly defined. 

 Pubescence short, sparse and pale. 



Belongs to Saussure's division a. It is not unlike S. trisculatus Cam., but 

 that species has the markings luteous, not white, the stigma testaceous, the 

 wings hyaline, the first abdominal segment with a distinct narrowed neck, and 

 the propleurae are punctured, not regularly striated as in the present species. 



Odynerus annulatus Say. 



This species appears to be fairly common and widely distributed, judging 

 by the number of specimens in Prof. Baker's collection, also it is a very vari- 

 able one. The varieties seem to run into local races. The variety from Fedor, 

 Texas, (Birkmann) is black, with the following parts rufous: Clypeus except 

 above, a broad line on the upper half of the outer orbits, pronotum except at 

 the base, tegulae, scutellum, sides of metanotum and the parts round the black 

 central spot on first abdominal segment ; yellow are the under side of the 

 antennal scape, clypeus, base of mandibles, the frontal spot, base of pronotum, 

 the postscutellum, sides and apex of first abdominal segment broadly, and the 

 apices of the second and third. Some of the red markings may be yellow 

 and vice versa, e. g., the clypeus, and the sides of metanotum may be yellow 

 or red ; the scutellum may rarely be black ; there may be a rufous spot on the 

 sides of the second abdominal segment at the base ; in most the postscutellum is 

 yellow ; in all the wings are fuscous violaceous. This variety may be known 

 as var. birkmanni. 



The form from Prescott, Congress, and Phoenix, .'\rizona (Oslar), and from 

 Berkeley, Colorado (Oslar), is smaller and has the yellow and red colors much 

 more extended. The female has the head and thorax red, with the ocelli, the 

 sides and base of mesonotum, and more or less of the pleurae and breasts 

 black; the top of the clypeus, a line on the eye incision, a line on the center 

 of the apex of pronotum, a large spot under the tegulae, sides of scutellum, 

 postscutellum, and the sides of the nietathorax broadly, Ijright lemon yellow : 

 the abdomen is bright lemon yellow, with the bases of the first and second 

 segments broadly red ; the wings are almost hyaline, smoky violaceous along 

 the anterior margin. The male of this variety has the front, vertex, occiput. 



