1904.] 21 



CiiABiio (CcELOCR.vBKo) sTTKius, Kohl, Ami. Nat. Hofm. Wicn, vii, 

 p. 198, T. xiii, figs. 7 and 10. 



Sitnilnr in general sliape to the otlier species of the subgenus 

 Cwlocrabro, but with the petiole of the abdomen rather more slender, 

 and more convex |)osteriorly, so as slightly to suggest the form of that 

 segment in the subgenus Rhopalum. 



Black, vei\v shining, licad witli somewliat scattered but clear punctures, face 

 with a deep impression running from the front ocellus to the clypeus, eyes very 

 convergent in both sexes, distant from each other in the region of tlie insertion of 

 the antennae less than the combined Icngtiis of tlie 1st and 2ncl joints of the flagel- 

 lum. Scape of the antenna; and mandibles piceous, the former unusually long and 

 slender and paler at the base and apex, palpi pale, head not nearly so much pro- 

 duced beiiind the eyes as in capiioxus, and less quadrate, its posterior sides more 

 rounded, occipital carina ending abruptly so as to give the effect of a slight tooth 

 under the cheek ; clypeus, viewed from above, subtruncate in the centre, viewed from 

 in front trituberculate, mesonotum very shining, punctui-ed, deeply impressed in the 

 centre anteriorly ; wings slightly clouded, tegula? testaceous ; legs pitchy-brown, 

 the apices of the femora, and the bases and apices of tlie tibice, and the anterior 

 and intermediate tarsi in both sexes paler, those of the S nearly colourless, and 

 the anterior femora in that sex with a pale central vitta ; yiropodeum shining, 

 without a defined area, but with a row of crenatures along the extreme base, and 

 with a very short, longitudinal, central impression, the sides clothed with silvery 

 hairs, this latter character less evident in the ^ ; abdomen very shining, and without 

 perceptible sculpture, even under a Coddington lens, although with a compound 

 microscope under an inch objective very fine transverse aciculations can be seen ; 

 petiole much slcndei'cr than in the allied species, apical dorsal valve in the ? nar- 

 rowly channelled and reddish-testaceous towards the apex, largely punctured at the 

 base. Long., 6 — 6j mm. 



^ and ? , Shiere (Capron) ; ? , New Forest, June, July, 1894, 

 (Champion) ; ? , Ley Hill, Chesham, Bucks, June 29th, 1899 (Piffard) ; 

 $ , Dollar, near Edinburgh, July 9th, 1901 (Evans) ; ? , uear Eaver- 

 sham, Kent (Chitty) ; ? , Porthcawl, June 29th, 1903 (Terbury). 



There arc only two species with which the above can confounded, 

 viz., cajjitostis and cetratus, from both of theui it can be distinguished 

 by the form of the clypeus, the longer and more slender auteuual 

 scape, the slender petiole, and the absence of visible sculpture ou the 

 abdomen ; both sexes are further distinguished from capitosus by the 

 less massive head, and from cetratus by the less closely punctured 

 mesonotum, and the ^ by the simple anterior tibi£B and metatarsi. 



Halictus semipunctulatus, l^chenck, Jahr. ver. Naturk. Nassau, 

 xxi— xxii, 1807/8 (1870), p. 308. 

 Closely allied to pauxilliis, iSchenck, and similar in general form 

 to the other small species. 



