Sept., 1904.] ViERECK AND COCKERELL : PHILANTHID.t:. 137 



mark triangular ; a pair of obliquely placed elongate light yellow marks on vertex ; 

 light spots on scutellura larger and much closer together ; apical half of hind tibia? 

 dark ; yellow band on second abdominal segment much narrower in the middle than 

 at the sides ; pygidial plate broadly rounded, not constricted at the end. Several of 

 these characters are no doubt variable, but the dift'erent pygidial plate is quite dis- 

 tinctive. As in C. convergens the stigma is piceous, and there is brilliant silvery 

 pubescence on each side of the clypeus. 



Habitat. — Southern New Mexico (Cockerell, B 4). The type was 

 collected at Rincon, July 5, at flowers of Chilopsis saligna. 



The enclosure of the metathorax in C. convergens and cliilopsidis is 

 smooth and dullish, with the usual median furrow ; in convergens its 

 lateral margins are delicately striate, but in chilopsidis they are punctate, 

 and the lower end of the furrow has some minute transverse ridges. 



Cerceris rinconis, new species. 



9 . Size and appearance of C. cJtilopsidis, but differs as follows : black clypeal 

 margin much shorter (more as in convergens); no supraclypeal mark; no mark on 

 vertex ; scutellum entirely black ; enclosure of metathorax dullish, its margin faintly 

 striatulate, not punctate ; apices of femora more or less reddish ; spot on first abdominal 

 segment very small ; pygidial plate narrowed apically. The stigma is piceous, and 

 the hair on each side of clypeus silvery. 



Habitat. — Southern New Mexico (Cockerell, B 4). The type was 

 collected at Rincon, July 5, at flowers of Chilopsis saligna. 



C. rinconis is certainly distinct from C. chilopsidis, but it will very 

 likely prove to be only a variety of C. convefgens. 



Cerceris novomexicana, new species. 



9 . Looks like vicina, but rather larger, and differs as follows : clypeus with 

 the anterior margin broadly truncate and gently concave, after the general style of C. 

 nigrescens ; scape stouter, bright yellow in front ; a large yellow spot on each side of 

 metathorax ; pygidial plate subtruncate at end ; anterior and middle femora with 

 more than the apical half bright yellow. The stigma is ferruginous, and there is no 

 patch of silvery hair on each side of the clypeus. The markings are very bright yel- 

 low. The anterior and middle tibiae are entirely yellow. The enclosure of meta- 

 thorax, as in vicina, is dull, without punctures or grooves but slightly longitudinally 

 striate. 



Habitat. — Johnson Park, N. M., at skunk-cabbage, July 7, 1903 

 (Anna Gohrman, No. 5). It is a little doubtful what plant is referred 

 to as "skunk-cabbage." 



This has many characters in common with C. deserta, Say, but 

 differs by the large yellow marks on metathorax, the character of the 

 punctuation, etc. 



