300 ANNALS NEW YORK ACADEMY OF SCIENCES 



36. Gaster black in female and worker.. (31) herculeanus ligniperda 



var. novehoracensis Fitch. 



Gaster deep red in female (32) herculeanus Ufjniperda var. 



rubens Wheeler. 



37. Thorax marginate on the sides and behind ; head and thorax fer- 



ruginous red (51) planatus Roger. 



Thorax not marginate; head and thorax black. . . . (50) mina zuni 



subsp. nov. 



38. Large species, averaging 10-11 mm. ; middle and hind tibise with 



bristles on their flexor surfaces 39 



Small species, averaging 6-8 mm. ; middle and hind tibife without 



bristles on their flexor surfaces 40 



39. Entirely yellowish red; clypeal notch rather shallow (47) 



schwfferi Wheeler. 



Head black, thorax and legs red ; gaster black, with first segment 



yellow at the base (46) texanus Wheeler. 



40. Thorax, with a distinct impression at the mesoepinotal suture... 4] 

 Thorax without a distinct impression at the mesoepinotal suture. 42 



41. Gaster entirely black or dark brown (48) hyatti Emery. 



Basal two-thirds of first gastric segment red.... (49) hyatti var. 



hakeri Wheeler. 



42. Head large, very broad, excised behind ; gaster very shining, with- 



out pubescence. Length, 8 mm (45) sayi Emery. 



Head smaller, narrower ; gaster pubescent, less shining ; length 



usually less than 8 mm 43 



43. Cheeks and clypeus with elongate, piligerous foveolse 50 



Cheeks and clypeus without such foveolae 44 



44. Body black, thorax at most only partially red ; average length, 



6.5 mm (33) fallax var. nearcticus Emery. 



Of a different color 45 



45. Both head and thorax reddish brown or yellowish red 48 



Head largely dark brown or black 46 



46. Average length, 5.5 mm 47 



Average length, 7 mm.; base of gaster banded with yellow. . (.36) 



fallax var. tanquaryi Wheeler. 



47. Thorax dark red, head and gaster black (34) fallax var. 



minutus Emery. 



Thorax ivory yellow, spotted with brown, base of gaster often 



banded with yellow (35) fallax var. pardus Wheeler. 



48. Average length, 6-6.5 mm 49 



Average length, 8 mm (38) fallax rasilis Wheeler. 



49. Gaster yellow at the base (39) fallax rasilis var. pavidus 



Wheeler. 

 Gaster black throughout (37) fallax var. decipiens Emery. 



50. Piligerous foveolse few on the cheeks, usually absent on the 



clj-peus 51 



Both cheeks and clypeus with numerous piligerous foveolfe 52 



51. Yellowish brown, gaster paler, with brown bands. ... (40) fallax 



subbarbatus Emery. 



