No. 2317. FIVE TRIBES OP ICHNEUMONINAE—ROHWER. 461 



ters other than color were observed. The small amount of material 

 makes it difficult to determine just how variable the color is, and the 

 following key, although it serves to distinguish the material at hand, 

 is not entirely satisfactory. In the only case where a series reared 

 from the same host is available, there is very little variation in color, 

 thus suggesting that there are many incipient species in the genus. 

 On tlie other hand, however, larger collections and more rearings may 

 prove that too many species are now recognized. 



TABLE TO SPECIES. 



1. Hind coxae black clypearius Ashmead. 



Hind coxae rufous or yellow with a line above 2. 



2 . Males ^ • 



Females 7- 



3. Hind coxa yellow with a black spot posteriorly; flagellum testaceous; thorax with 



abundant yellow marks pulcherrimus (Cresson). 



Hind coxa rufous ; flagellum black or piceous, throacic markings whitish 4 . 



4. A distinct yellow spot posterior to origin of hind wing burgessi (Cresaon) . 



No yellow spot posterior to origin of hind wing 5. 



5. Propodeum entirely black; hind femora not black basally pleuralis Creeson. 



Propodeum with yellow marks posteriorly b. 



6. Sides of propodeum black; a black band at base of hind femur; second and third 



tergites subequal annulatus (Provancher). 



Sides of propodeum rufous; hind femur without a black band basally; third tergite 

 shorter than second vulgaris Cresson. 



7. Inner orbits lined with yellow; if line is interrupted, the hind femur is entirely 



rufous 8. 



Inner orbits black or with a small yellow spot dorsally; hind femur with a black 

 preapical band 9- 



8. Hind femur with a black preapical band followed by an apical band of yellow; 



sides and lower part of thorax rufous facialis Rohwer . 



Hind femur uniformly rufo-ferruginous; sides of thorax mostly black. 



disiinctus Cresson. 



9. Anterior basitarsi half or slightly more than half as long as their tibiae; small 



species. 



10. 



Anterior basitarsi fully two-thirds as long as their tibiae 12 . 



10. Clypeus black; inner margins of eyes not converging below; propodeum with a 



longitudinal depression dorsally parvus Rohwer. 



Clj-peus yellow; inner margins of eyes slightly converging below; propodeum with- 

 out a dorsal longitudinal depression 11. 



11. Second and third tergites subequal in length ; band on tergites 1 to 4 reduced to 



testaceous lines; mesosternum and lower part of episternum black. 



californicus Cresson. 



Third tergite distinctly shorter than the second; bands on tergites distinct, yellow ; 



mesosternmn and lower part of mesepisternum reddish pleuralis Cresson. 



12. Mesepisternum with a broad yellow line below plesia Rohwer. 



Mesepisternxma below, the sternum and sides of propodeum rufous. 



burgessii (Cresson). 

 Mesepisternum (except a small spot posteriorly) and sternum black 13. 



13. Species slender; second and third tergites of subequal length. 



annulatus (Provancher). 

 Species robust; third tergite distinctly shorter than the second vulgaris Cresson. 



