■^ ^.^l/O 







THE ENTOMOLOGIST. 



Vol: LL] DECEMBEE, 1918. [No. 667 



SOME HALICTINE BEES. 

 By T. D. a. Cockerell. 



Halictas riparielhis, n. sp. 



9 . Length about 8 mm., anterior wing 7 mm. ; black, with dark 

 brown tegulte (pale-margined in front), and dilute reddish-grey wings, 

 the stigma amber-colour ; clypeus and supraclypeal area polished, 

 the former with sparse punctures ; clypeus prominent, with long 

 black hairs from its lower margin ; mesothorax shining, the small 

 punctures not very dense on disc ; hair of thorax above pale ochreous ; 

 area of metathorax large, semilunar, finely rugulose ; posterior trun- 

 cation with no sharp rim at sides ; hind spur with triangular saw-like 

 teeth ; abdominal segments 2 to 4 with broad basal bands of oehreous- 

 tinted tomentum, in old specimens practically white. 



Florissant, Colorado, .June 26th, 1907, nesting in a bank 

 {Cockerell) ; type. Also Florissant, June 23rd [Rolnvcr). I had 

 confused this with H. trizonatus, Cresson, which also occurs at 

 Florissant in June, but it is smaller, with the apical part of 

 second abdominal segment shining (dull in trizonatus). Under 

 the microscope the punctures on apical part of first segment are 

 seen to be very minute and piliferous, while in trizonatus they 

 are large and coarse in comparison. A nearer approach to 

 //. ripariellus is found in the eastern H. coniaceus, Smith, which 

 is, however, larger and stouter, with the flagellum largely ferru- 

 ginous beneath (very dark brown in ripariellus). The area of 

 metathorax in coniaceus is very delicately plicatulate on basal 

 half ; in ripariellus it is microscopically reticulate in the same 

 region, and has very delicate oblique lines on apical part toward 

 the sides. 



Halictus typographicus, n. sp. 

 (^ . Length about 7-5 mm., anterior wing 6 mm. ; clypeus with a 

 broad pale yellow band ; vertex, mesothorax and scutellum dark 

 blue ; abdomen very obscurely greenish ; flagellum very long, hght 

 ferruginous beneath ; tegulge rufous, dark at base ; wings clear ; 

 stigma and nervures ferruginous. Close to H. nearcticus, Vachal, 

 differing thus : clypeus more produced, and its yellow band paler ; 



ENTOM. — DECEMBER, 1918, Z 



