CHARLES W. METZ. 147 



Sculpture. — Head, thorax and abdomen very heavily, densely punc- 

 tured. Front, vertex, and occiput heavily, confluently punctured ; 

 punctures running into striae on cheeks. Mesoscutum entirely covered 

 with crowded, almost confluent punctures, somewhat smaller than 

 those of head ; scutellum densely punctured with somewhat larger 

 punctures; metanotum about half as long as scutellum, rugose. En- 

 closure of propodeum normal, clearly defined, irregularly pitted on 

 superior face ; remainder finely rugulose ; rest of propodeum ranging 

 from coarsely rugulose laterad of bowl of enclosure to finely rugulose 

 on lateral areas of posterior face. Mesopleura punctured similarly, 

 and almost as densely as mesoscutum ; metapleura rugose, not con- 

 spicuously striate. Dorsum of first three abdominal segments heavily 

 punctured with round, clear cut punctures about the size of those on 

 mesoscutum, separated by about one-fourth the diameter of one punc- 

 ture ; remaining segments distinctly, but more lightly punctured. 



Yelloiv Markings. — Face marks only on clypeus and lateral areas, 

 the supraclypeal area being dark ; clypeal mark broader at base than 

 lateral marks at that level ; lateral marks long, not following outline 

 of antennal sockets, but slanting off from slightly above base of cly- 

 peus, gradually narrowing to truncate tips at about one-third the 

 length of scape above the sockets. Stripe on each side of collar, 

 tubercles, and often tegulae and wing bases yellow. Front of fore 

 tibiae, basal third of middle and hind tibiae, and basitarsi yellow, 

 (figs. 112, 113). 



Genitalia. — Armature indistinguishable from that of P. asi7iinus or 

 P. ivootoni. Seventh ventral plate differs from that of the other two 

 only by the long, narrow basal lobe, (fig. 57). Eighth ventral plate 

 differs from that of coloradensis only in its smaller size, (fig. 65). 



Female. — Indistinguishable from that of P. wootoni (fig., 122). 



Habitat. — California. Especially common in Southern 

 California, being by far the most common species in this 

 region. 



Specimens examined : About 150. 



This species is very nearly related to P. ivootoni, being 

 perhaps only a variety of that. The lateral face marks of 

 the male vary considerably in a series : sometimes the lateral 

 marks fill all the space in the lateral areas, but usually they 

 are more poorly developed than in the specimen figured. 

 Often there is considerable dark space between the lateral 

 marks and the clypeal mark, in which case the upper exten- 

 sions of the lateral marks are usually pointed and narrow. In 

 some specimens the lower and lateral portions of the clypeus 

 are dark. In no specimens is there any yellow on the supra- 



TRANS. AM. ENT. SOC. , XXXVII. 



