ART. 19. AMERICAN BEES OF THE GENUS HALICTUS — SANDHOUSE. 15 



of propodeum without a distinct inclosing rim, shining, plicae extend- 

 ing across the disk and reaching the apex; truncation clearly defined 

 laterally; tegulae very pale, impunctate. Abdomen obovate, shining; 

 segments 1-2 rather sparsely pubescent; segments 3-5 clothed with 

 dense, appressed hairs; apical margins of segments testaceous. 

 Wings clear; anterior wing about 3.5 mm. long; stigma and 

 nervures honey color, except the costal nervure which is dark 

 testaceous; second submarginal cell higher than broad, receiving 

 the first recurrent nervure very near the apex; third submarginal 

 little longer than second on marginal. Legs dark, covered with 

 white hairs; knees and tarsi clear red; hind spur not visible. 



Habitat. — Woods Hole, Massachusetts (Eleth Cattell). 



Type —Cat. No. 26405, U.S.N.M. 



HALICTUS (CHLORAHCTUS) TENAX, new species. 



Female. — About 5.5-6 mm. long; head and thorax dark blue-green; 

 abdomen black; pubescence yellowish white, sparse. Facial quad- 

 rangle longer than broad; orbits converging slightly below ; antennae 

 entirely dark; face shining dark blue; vertex closely punctured; 

 front with a brassy tint, sparsely punctured; supraclypeal area 

 and upper half of clypeus somewhat brassy, rather closely punc- 

 tured; clypeus shining black below, with few coarse downward-open- 

 ing punctures; apex of mandibles red. Mesothorax shining, micro- 

 scopically lineolate; quite closely punctured, the punctures a lit- 

 tle more scattered on the disk; scutellum closely punctured, two 

 smooth spots on the disk, each of these spots has two very large punc- 

 tures; disk of propodeum without an inclosing rim, smooth, shining, 

 dark blue, with a few plicae at the base of the disk only; truncation 

 well defined laterally; tegulae dark testaceous, impunctate. Abdo- 

 men obovate, piceous, impunctate; segments 1-2 almost without hairs; 

 segments 3-5 with sparse white hairs; apical margins of segments 

 narrowly testaceous. Wings faintly dusky; anterior wing 4 mm, 

 long; stigma and nervures testaceous; second submarginal cell higher 

 than broad, receiving the first recurrent nervure near the apex; third 

 submarginal about one and one-half times as long as second on mar- 

 ginal. Legs dark with yellowish white pubescence; hind spur pecti- 

 nate with three moderately long teeth; tips of hind basitarsi and 

 apical tarsi reddened. 



Habitat. — Longs Peak Inn, Colorado, June 25, and August 13 

 (Cockerell). Three specimens. 



Tyjje.— Cat. No. 26406, U.S.N.M. 



Differs from viridatulus Cockerell by the shining mesothorax with 

 weak punctures, not lineolate; head, mesothorax, and propodeum 

 more brilliant blue; disk of propodeum without such strong plicae. 



