258 ENTOMOLOGICAL NEWS. [June, '08 



Metathorax with an enclosure pedicellatum Pack. 



Metathorax without an enclosure i. 



i. Abdomen banded with reddish, anterior four legs entirely yellow ; 



basal joint of middle tarsi simple rufog aster Pack. 



Abdomen black ; anterior four legs more or less black ; basal joint of 

 middle tarsi with a spine within modestum Roh. 



The following table will separate all the species mentioned above : 



Females , i. 



Males 16. 



1. Pygidium broad, flat, not strongly excavated towards apex .... 2. 

 Pygidium narrow, strongly excavated 10. 



2. Small species; abdomen entirely black 3. 



Large or medium size species; abdomen marked with yellow ... 5. 



3. Ocelli in a low triangle errans Fox. 



Ocelli in an equilateral triangle 4. 



4. Shining; scutellum yellow; fore trochanters and femora reddish. 



cockerelli Roh. 

 Subopaque; scutellum black; fore trochanters and femora black. 



eriogoni Roh. 



5. Ocelli in an equilateral triangle; head and dorsulum finely punctured; 



mesopleurae shining, with a few punctures . . cocfertus Fox. 

 Ocelli in a low triangle 6. 



6. Mesopleurae shining; with few punctures 7. 



Mesopleurae subopaque, striato-punctate or striated 8. 



7. Stigma and costa dark brown ; ocelli (dry) deep black ; metathorax 



more strongly sculptured conspicuus Cress. 



Stigma and costa ferruginous ; ocelli (dry) yellowish ; metathorax 

 not so coarsely punctured vincus Cress. 



8. Pygidium strongly margined by a wall, slightly but distinctly de- 



pressed apically ; head not larger than usual. . .dilectus Cress. 

 Pygidinm not thus margined, not depressed apically; head large. . 9. 



9. Enclosure of metathorax striato-punctate ; legs partly rufous. 



rufifemnr Pack. 



Enclosure of metathorax obliquely striated ; legs yellow and black. 



megacephalns Roh. 



10. Ocelli in an equilateral triangle ; shining black . . . nigricornis Prov. 

 Ocelli in a low triangle ii- 



11. Clypeus produced into a truncated process 12. 



Clypeus rounded anteriorly, not produced into a truncate process.. .13. 



12. Head densely, finely punctured; clypeus with some golden pubes- 



cence nokomis Roh. 



Head with large punctures ; pubescence of clypeus silvery. 



bellus Cress. 



13. Posterior face with strong lateral ridges ; abdomen with small yellow 



spots ; slender head, thorax and abdomen nude . operus Roll. 

 Posterior face of metathorax without strong lateral ridges .... 14. 



