20 AMERICAN HYMENOPTERA. 



Space between eyes above much greater than tlieir lengtli, the hind ocelli 

 separated by a distance much less than that between them and eyes. 



taiiruliis. 



Space between eyes above but little greater than their length, the liind 



ocelli separated by a distance about equal to that between them and 



eyes laticiiictiis. 



Legs rufous and yellow. 



Ground color rufous, mesothoracic punctures of medium size • iitaIieUKi<$. 

 Ground color black, or black and rufous, niesothorac punctures large and 



coarse eonciiiiiiiluN. 



Face more or less hairy, but never thickly so. or appressed. 

 Clypeus lobed. not dentate. 



Ground color yellow, antenuse subtiliforra foxi. 



Ground color black, autennse filiform bsikfi'i. 



Clypeus distinctly 3-dentate. 



Third joint of autennge longer than joints 4-5 combined. Silbfrigidiis, 

 Third joint of antennse not longer than joints 4-5 combined, -frij^idus. 



ApIiilaiitliop!s> frigidiis Sra. 



Philunthns frigidus Smith, Brit. Mus. Cat. Hym. iv, p. 475, % . 

 Aphilanihops frigidus Patton, 1. c, p. 401, 1880. % 9- 



9. — Length 11-15 mm. Black with yellow markings. Head, except on front, 

 covered with a sparse gi-owth of fine hair; black, except three broad stripes on 

 face (two on eye margins and one below antennal base), and sometimes a line 

 behind eyes, which are yellow, finely and closely punctured ; eyes farther apart 

 than their greatest length ; ocelli as far from nearest eye-margin as the length of 

 third joint of antennae, sometimes a barely noticeable smooth shining spot be- 

 hind ; clypeus 5-dentate, sparsely covered with shallow puuctures; mandibles 

 piceous, yellow outwardly at base; antennae subfiliform, scape yellow spotted' 

 flagellum ferruginous at base and at tip of last joint, third joint barely as long 

 as 4-5 combi7ied. Thorax black, a line on collar (usually interrupted) spots on 

 scutellum, postscutellum. posterior angles, tegulae and spot behind tubercles (all 

 liable to be absent) yellow, covered with a sparse growtli of brown hair; meso- 

 thorax strongly wrinkled, closely and finely punctured ; scutellum more coarsely 

 punctured ; metathorax closely and finely punctured, elevation smooth, shining, 

 prominent and not divided by suture, a circular cavity above. Abdomen black, 

 with two large yellow spots on first segment, a band on second narrowly inter- 

 rupted, like bands on 3, 4 and 5 sometimes connected; finely and closely punc- 

 tured ; a few hairs on first; a somewhat triangular cavity on pygidium contain- 

 ing large shallow punctures; subdepressed ; venter black or piceous. a few yellow 

 spots : sometimes absent), a few haii-s laterally and with large scattered puuctures ; 

 coxae black, sometimes yellow spotted, first half (and sometimes ahnost all) of 

 femora black or piceous, rest yellow; tibia yellow; tarsi yellow, ferruginous at 

 tips. Wings clear, sometimes darkened, nervures ferruginous, light spot before 

 stigma. 



'^ . — Length 10 mm. ; smaller and narrowed, abdomen ovate, not depressed ; 

 eyes not as far apart as their greatest length ; clypeus 3-dentate ; yellow spot^ on 

 sixth segment and yellow on venter more extended ; otherwise as in 9 . 



Hub. — Illinois, Massachusetts. Connecticut, New Jersey, Canada, 

 Colorado, Montana. Eleven females and one male. The specimens 



