148 AMERICAN HYMENOPTEKA. 



Other. Third antennal segment longer than fifth, the fifth longer than 

 the fourth. 



Thorax. — Dorsum clothed with straw-yellow pile, except for black 

 band between bases of wings (this band well defined and without pile 

 in middle). Mesopleura with mostly yellow pile from bases of wings 

 to bases of legs. Metapleura with at least their upper portions bear- 

 ing mostly yellow pile. Sides of median segment with mostly yellow 

 pile. 



Abdomen. — Dorsum : segments one to three, inclusive, clothed with 

 straw-yellow pile ; segment four with pale yellow pile on basal portion 

 and with pale ferruginous pile on apical portion ; segment five with 

 mostly white hair (the bases of the hairs, making up the pile on this 

 segment, appear slightly ferruginous); segment six thinly clothed with 

 mostly white pile. Venter with mostly dark pile, but the hairs fring- 

 ing the apical margins of the middle and apical segments inclined to 

 be pale in color towards the sides of the segments. 



Wings. — Somewhat infuscate, but light in color ior a. Boinbus queen; 

 about as dark as those of rufocinctus queen. 



Legs. — Trochanters with mostly dark pile, but with at least a sprinkl- 

 ing of pale hairs on their lower sides. Femora mostly dark, but with 

 more or less pale hair on their lower sides, the two hind pairs in par- 

 ticular having a noticeable amount of such pile. Tibiae with dark hair, 

 including the corbicular fringes. 



Worker. — Like queen, but with fifth dorsal abdominal segment 

 clothed with entirely ferruginous pile. Sides of head behind eyes 

 with only a very slight admixture of pale yellow hairs. 



Dimensions. — Length : queen, 16 mm. ; worker, 13| mm. Spread 

 of wings : queen, 37 mm. ; worker, 30 mm. Friese originally described 

 the queen as being from 22 mm. to 23 mm. in length. 



Boiubus (Bouibias) weisi Friese. 

 Bombus weisi Friese, Zeitsch. f. System. Hym. und Dipt., Jahrg. Ill, 

 Heft 4, 1903, p. 253, c? ( 8 ?), and the variety albo- 

 caudata. 

 " " Friese, Zeitsch. f. System. Hym. und Dipt., Jahrg. IV, 



Heft 3, p. 188, n. 17, cf. 



Types. — In Friese's private collection. The species was 

 originally described from tv^o workers and nine males, all 

 from Costa Rica (San Carlos). The variety a /l>oca?cda fa was 

 described from a single male from Bolivia. 



I have never seen a female of this species, and I seriously 

 question whether the workers described by Friese did not in 

 reality belong to the species montezumce, as his description 

 answers perfectly for a color variation of that species. Friese 



