HENRY J. FRANKLIN. 451 



4. First dorsal abdominal segment mostly covered with yellow pile. 



ashtoui. 

 First segment entirely dark 6. 



5. Third and fifth antennal segments subequal in length ...suckleyi. 

 Fifth antennal segment nearly equalling the length of the third and 



fourth together consilltus. 



6. Scutellum entirely dark crawfordi. 



Scutellum with much yellow pile variabilis. 



THE LABORIOSUS GROUP. 



Characters of the Group. 



Female. — Occiput with a triangular patch of yellow pile. 

 Malar space medium. Hind metatarsi about three times as 

 long as their greatest width. Lateral elevations of hypopy- 

 gium moderate, their anterior portions being more or less 

 rounded and higher than their ridge-like posterior portions. 



Male. — Flagellum of antenna distinctly more than three 

 times as long as the scape ; the fifth antennal segment dis- 

 tinctly longer than the third. Clasper of genitalia (figs. 93, 

 94 and 97) with squama strongly and broadly bilobed, both 

 lobes being somewhat pointed toward their tips. Shaft of 

 sagitta with a prominent tooth-like projection on its ventral 

 side, somewhat beyond the middle. 



Psithyrus laboriosus F. 



? Apis alata Fabricius, Suppl. Entom. Syst., 1798, p. 274, no. 43-44. 

 Bombus laboriosus Fabr. Syst. Piez., 1804, p. 352, n. 51. 

 Bombus elatus Fabricius, Syst. Piez., 1804, p. 352, n . 49. 



" Illiger, Magaz. f. Insektenk., V, 1806, p. 171, no. 41. 

 Illiger, Magaz. f. Insektenk., V, 1806, p. 174, n. 62. 

 Apathus citrinus Smith, Catal. Hymen. Brit. Mus., II, 1854, p. 385, n. 

 7, c?. 

 " laboriosus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. Ill, n. 



1, 9. 

 " conti^uus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 112, n. 



4, cf . 

 " citrinus Cresson, Proc. Ent, Soc. Phila., II, 1863, p. 112, n. 

 5, cf . 

 Walsh, Proc. Ent. Soc. Phila., Ill, 1864, p. 247, cf . 

 laboriosus Walsh, Proc. Ent. Soc. Phila., Ill, 1864, p. 247, 9 . 

 " citrinus Packard, Proc. Essex Instit., IV, 1864, p. 119, c?. 

 " contiguus Packard, Proc. Essex Instit., IV, 1864, p. 129, cf. 



TRANS. AM. ENT. SOC, XXX VIII. 



