536 PROCEEDINGS OF THE NATIONAL MUSEVM. vol.55. 



Genus CRYPTOIDEUS Ashmead. 



Xylophruridea Viekeck, Proc. U. S. Nat. Mns., vol. 42, 1912, p. 646. 

 In Schmiedeknecht's key to the Cryptini (Genera Insectorum) the 

 genotype runs, on most of the characters used, to Xylophi'urus Foer- 

 ster, but differs from his description of that genus in having the head 

 strongly transverse though wide behind the eyes; the mandibles not 

 gibbous at the base; propodeal spiracles very broad oval; abdomen 

 stout. Within the genus, as defined by the species here included, there 

 is marked variation in all of the above characters except that of the 

 mandibles. The genotype of Xylophururidea^ Cryptoideus agrili 

 (Viereck), has the temples very long and broad, while one of the new 

 species, Cryptoideus hicolor, has the abdomen rather slender and the 

 spiracles long oval. This leaves the mandibular character as the only 

 irreconcilable one to separate the two genera. 



KEY TO NORTH AMERICAN SPECIES, FEMALES. 



Black with abdomen red bicolor, new species. 



Black 1 



Ferruginous 2 



1. Legs largely red nubilipennis (Cresson). 



Legs black 3 



2. Malar space longer than basal width of mandible; propodeal spiracle elon- 



gate Uictuosus (Provancher). 



Malar space shorter than basal width of mandible; propodeal spiracle 

 round agrili Viereck 



3. Head posteriorly wider than eyes ; apical carina of propodeum obsolete me- 



dially fasciattis (Ashmead). 



Head posteriorly not wider than eyes 4 



4. Apical carina of propedeum broadly interrupted in the middle ; wings very 



dark purplish brown purpuvipennis (Cresson), 



Apical carina of propodeum complete; wings subhyaline 5 



5. Head behind the eyes as broad as the eyes, the temples not sloping, mostly 



ferruginous; antennae white annulate; areola not at all defined laterally, 



the basal carina subangulate medially rnfus, new species. 



Head behind the eyes narrower than the eyes, the temples sloping, mostly 

 black ; antennae not annulated ; areola defined laterally, the basal carina 

 broadly curved medially sitkensas Ashmead. 



CRYPTOIDEUS AGRILI (Viereck). 



Xylophruridea ag7'ili Viereck, Proc. U. S. Nat. Mus., vol. 42, 1912, p. 646. 



Some additional characters of this species, drawn from type ma- 

 terial, that help in distinguishing it from related species are as fol- 

 lows: Temples slightly wider than ej^es, straight for most of their 

 length, then abruptly rounding off to the occipital carina ; posterior 

 orbits only obscurely brownish; malar space shorter than basal 

 width of mandible; first joint of flagellum longer than second; 

 sternauli weakly indicated anteriorly ; propodeal spiracle round ; basal 

 carina of propodeum not curved medially to base and with a rather 



