Piecords of Bees. 301 



front ; two broad stripes, not very long, on anterior part of 

 mesothoraK, these completely isolated from the ochreous 

 band; axillar teeth short ; mesopleura with dense ochreous 

 hair along anterior margin, and a broad band running 

 across the middle, below this is a large quadrate black area ; 

 tegulae black, the margin brownish. Wings dusky hyaline, 

 nervures fuscous. Legs coloured as in T. cuneatus. Abdo- 

 men marked as in T. cuneatus, but apical band on first 

 segment rather widely interrupted, and that on second 

 sometimes interrupted ; segments 3 and 4 with entire 

 bands ; fifth with a large ochreous patch on each side of 

 the modified area ; last ventral segment straight in profile. 



Meadow Valley, :\Iexico (C. H. T. Towiisend). U.S. 

 Nat. Museum. 



Close to T. cuneatus, but on account of the different 

 ornamentation of mesotiiorax it must be considered distinct. 

 The eyes are yellow-greeu, not bluish green as in typical 

 helianthi. In helianthi the black lower part of pleura is not 

 enclosed by ochreous. 



Triepeolus medusa y sp. n. 



? (type). — Length about 11'5 mm. 



Black, of the type of T. helianthi ; mandibles reddish in 

 middle ; clypeus shining, finely punctured, a few indistinct 

 large punctures; region of antennae with ochreous hair; 

 third antennal joint dark reddish in front ; hair-markings 

 of thorax and abdomen pale, faintly yellowish, almost 

 greyish ; mesotiiorax with a narrow band along sides and 

 behind, but not in front ; disc with two parallel broad 

 stripes ; axillar spines small and obscure ; mesopleura with 

 a band across middle, the black region below not enclosed ; 

 tegulse piceous. Wings strongly dusky. Legs coloured as 

 in T. cuneatus and concinnus. Abdomen essentially as in 

 concinnus, bands on first and second segments interrupted, 

 band on second segment with an elongated process directed 

 cephalad on each side. Spurs black. 



^ . — Face covered with pure silvery-white hair ; meso- 

 pleura covered with silvery-white hair; parallel stripes of 

 mesotiiorax less developed; middle femora broadly black 

 above ; first three abdominal bauds interrupted, and the 

 fourth with a linear interruption, not quite complete. 



Federal District, Mexico, "7 and 8, 10." U.S.Nat. 

 Museum. 



The specific name was suggested by the black area on 



