Vol. XXV] ENTOMOLOGICAL NEWS IO3 



Legs dark brown. 



Abdomen dark aeneous-brown, all the segments except the fifth 

 distinctly inflated on either side just above the broad apical margin; 

 margin of the segments lineolate but not punctured or different in 

 color from the rest of the segments. Discs of all except the first 

 segment with very fine punctures. Last three segments very scantily 

 pubescent along the apical margin. 



Pubescence very scant, distinctly buffy on the legs. 



Habitat. Phoenix, Arizona (Kunze), i (type), a second 

 specimen, similarly labeled but badly broken. 



This species is probably related to H. tegnlaris Robertson 

 and the other small species with more closely punctured tegu- 

 lae, from which the finer more scattered punctures of the tegu- 

 lae, the dusky wings, and the smaller size distinguish it. The 

 inflation on the sides of the abdomen relates it to H. coactus 

 Cresson, and H. jamaicae Ellis. H. perparvus is the species 

 recorded from Arizona as H. pseud otegularis by Cockerell in 

 Canadian Entomologist, 1898, p. 237. 



Halictus crassiceps sp. nov. 



$ Length 6 to 7.5 mm. Head and thorax dark greenish-blue, ab- 

 domen very dark brown to black. 



Head variable in actual size, usually as broad as the thorax, some- 

 times broader in large specimens ; facial quadrangle almost square, a 

 little shiny, finely and closely punctured above the antennae, the punc- 

 tures more scattered over the lateral areas of the face, median carina 

 very short, supraclypeal area narrow and well elevated ; clypeus very 

 short, not at all produced. Cheeks full, shiny, finely punctured, and 

 openly lineolate. 



Thorax finely roughened on the sides ; metapleurae with fine regular 

 plicae over the upper half ; mesonotum very smooth and shiny, usually 

 without lineolations, very finely and very sparsely punctured ; median 

 and parapsidal grooves distinct but not deep. Truncation of the meta- 

 thorax with distinct lineolations and coarse scattered punctures ; a 

 small, impunctate, triangular area at the middle of the upper margin ; 

 basal area broad and concave, without a salient rim except near the 

 middle; the surface lineolate, and with relatively few, fine, sharp, 

 simple or branched rugae, well separated from each other and usually 

 reaching the edge, the middle one stronger and simpler. Tegulae 

 testaceous, impunctate and shiny. 



Wings hyaline, a little milky, stigma and nervures pale honey color, 

 costal nervure darker. 



Legs black, tarsi dark testaceous. 



