262 AMERICAN HYMENOPTERA. 



Males. — Antennae of less than average length for Bombus 

 males. Posterior tibia fringed with long hairs on anterior 

 and posterior borders, forming a more or less strong car- 

 bicula. Hind metatarsi with hind fringes short or very 

 moderate, never very long ; their outer faces strongly con- 

 caved and with pubescence sparse and uneven. 



Genitalia. — Outer spatha very short (front to rear) in com- 

 parison with its width — side to side — (fig. Ill); anterior 

 angles widely rounded ; anterior margin widely, deeply, and 

 evenly incurved ; posterior margin broadly and rather evenly 

 outcurved except on sides, where it appears to be more or less 

 truncate ; ventral surface, near posterior margin, bearing a 

 tuft of rather long, loose hairs. Inner spatha (figs. 113 and 

 135) variable, not only for the group but for each species in 

 it ; always more or less deeply bifid at the apex and with a 

 large fenestra near the middle ; often with two or three 

 smaller fenestrae toward the apex ; apical margin pretty well 

 covered with hair on ventral surface or nearly hairless ; ven- 

 tral surface somewhat reticulate. Each clasper (figs. 119 

 and 120) short, thick, and stubby ; branch wide at the base 

 but narrowing rapidly to an almost pointed apex as seen 

 from either above or below. Volsella considerably hidden, 

 except toward the apex, within the branch ; considerably 

 wider at the base than toward the apex, apex appearing very 

 hairy and obliquely truncate and with a rather narrow re- 

 curved apical projection. Squama almost divided by a deep 

 notch on the inner side ; inner lobe triangular and pointed 

 on inner side. Sagitta wide and flaring, with twisted shaft ; 

 head bluntly pointed at apex and with wide base, the margins 

 being irregularly serrate. 



Bombus (Bombus) terrestris var. moderatus Cress, 

 Bombus modestus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 99, n. 

 22, 9 (not Smith). 

 " moderatus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 109, 



n. 22. 

 ' ' terrestris var. ferrugineus Schmiedeknecht, Jenaisch. Zeitschr. 



f. Naturw., XII, 1878, p. 359, ? 8 cf. 

 " moderatus Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 

 230 (Catal.). 



