THE CANADIAN ENTOMOLOGIST. 77 



Halidus helkuilhi, n. sp. One female. 



Length about 4 mm., anterior wing 3 mm.; head and tliorax 

 dark green, abdomen and legs piceous; hind margins of abdominal 

 segments obscurely reddish; pubescence dull white; wings hyaline, 

 iridescent, nervures and stigma testaceous. Head ordinary; eyes 

 converging below; mandibles dark ferruginous, black at base; 

 antennae dark, flagellum obscurely reddened beneath apically; 

 teguke piceous, strongly punctured; mesothorax dullish, fineh^ 

 and distinctly punctured; area of metathorax delicately sculptured. 



Microscopic characters: Front densely punctured; a delicate 

 keel between antennae; tegulse well punctured; mesothorax reticu- 

 lated between the punctures, which are well separated on disc; 

 area of metathorax with few, delicately wrinkled plicae, on a 

 minutely reticulate surface, and with no sharp or shining edge 

 posteriorly; scutellum rather sparsely punctured; abdomen with 

 very minute scattered punctures, close to //. perparvns Ellis 

 from Arizona, but per parvus differs thus: Mesonotum yellow- 

 green, contrasting with the dark blue-green of rest of thorax (in 

 helianthi no marked contrast; mesothorax is an obscure olive 

 green) ; second and third abdominal segments not, or not notice- 

 ably, punctured (in helianthi very distinctl}^ punctured in the sub- 

 l)abal region, where the pigmentation is strongest); plicae of area 

 of metathorax of same general type, but larger and more numerous, 

 and the minute reticulation is stronger and yet more minute, 

 producing the appearance of a very finely malleate surface (in 

 helianthi, especially apically, there are very delicate mainly trans- 

 verse lines) ; plumose hairs on posterior face of metathorax shorter. 

 (The nearest relative in Southern California is //. tegular if ormis 

 Crawf., which I took at La Jolla in August; this is larger than 

 helianthi and has the mesothorax brighter, yellowish green.) 



Agapostemon texanns Cresson. Two females. 



Melissodes aurigenia Cresson. One female, collecting pollen; 

 7 males, three of them denuded. 



Pseiidomelecta calif ornica Cresson. One female. 



Diadasia enavata Cresson. One female, collecting pollen. 



The absence of any species of Andrena and Megachile is note- 

 worthy. A single Bombus was seen on the flowers, but not cap- 

 tured. No honey-bees were on the flowers, though they were in 

 the vicinitv. 



