164 AMERICAN HYMENOPTERA. 



The characters assigned to forbesli are not very clearly indicated 

 in Mr. Robertson's description, but I have an example of that species 

 from Algonquin, 111., collected by Dr. Nason and sent to me by Mr. 

 Baker, which agrees with the specimens from New Mexico. 



/?. Tegulse dark testaceous, smailer species. 



Ilalcctus amicus n. sp. 9- — Length about 8.5 mm. Black, with short, 

 dirty white pubescence, which gives it the appearance of being dirty. Head 

 rather large and broad, face and cheeks with sparse feathery pubescence, most 

 conspicuous at sides of face and just behind the eyes, hairs on front margin of 

 clypeus slightly tinged with golden ; antennte wholly black, flagellum minutely 

 punctured, its first joint very short, even a little shorter than second ; clypeus 

 rather sparsely punctured ; front so closely punctured as to be dull and granular 

 in appearance. Thorax tolerably hairy at sides, on postscutellum and at sides of 

 scutellum, and on metathorax, except the enclosure; postscutellum hoary; meso- 

 thorax shining, with large, moderately close punctures, parapsidal grooves dis- 

 tinct; scutellum very shining, the punctures more or less failing centrally ; en- 

 closure of metathorax semilunar not truncate, very minutely wrinkled, bounded 

 by an obtuse ridge. Legs black, claws rufescent. first joint of hind tarsus with 

 a curious little brush of bright rufous hairs at its tip ; tegulie testaceous. Wings 

 hyaline, beautifully iridescent, nervures and stigma honey-yellow or pale ferru- 

 ginous, costal nervure black, second submarginal cell not longer than broad. 

 Abdomen shining, minutely punctured, margins of segments slightly testaceous; 

 first three sutures with more or less distinct hair bands, the first mostly on the 

 base of the second segment, the second somewhat failing in the middle, the third 

 about equally on the adjoining segments, broad and entire; the bands are not 

 dense like those of forbesii, nor have they any yellowish tinge ; the segments 

 after the second are pruinose with scattered hairs; hairs of apex whitish; the 

 development of the hair-bands varies: the second may be continuous and broad. 

 When the abdomen is much extended the shining articulating surfaces of the 

 bases of the segments appear, dividing the bands into two, the strong basal and 

 the more feeble apical. 



jH"a6. — Mesilla Valley, New Mex., on the College Farm ; two on 

 Sisynibrium March 23 and 31, 1897 ; six on plum March 23, 25 and 

 26, 1896. 



From H. amicus : 



H. arcnatm Rob. differs at once by the niuch more strongly 

 wrinkled enclosure of metathorax, but it is a very similar species. 



H. farmosus Sm. differs by its larger size, the interrupted rim of 

 the metathoracic enclosure, and the fulvous anal rima. 



H. capitosus Sm. differs by the pale, fulvous, thoracic pubescence, 

 fusco-hyaline wings, etc; This is now considered to be the same as 

 ligatus. 



H. desertus Sm. differs by the black tegulte, etc. 



