24 BEES OF GREAT BRITAIN. 



2. Halictus xanthopus. 



H. niger, rufo-pubescens ; thorace ferruglneo; abdomine seg- 

 mentis utrinque basi pallidis; pedibus posticis fulvis. 



Melitta xanthopus, Kirbij, Hon. Ap, AngL ii. 78. 34 (J $ . 

 Lasioglossum tricingulum, Curtis, Brit. Ent, x. t. 14 c?, 

 Halictus xanthopus, Brulle, Rvped, Moree, iii. 349. 769. 



>S'/. Farg. Hf/m, ii. 273. 10. 



Sirdth, ZooLy'u 2173. 25. 



Nyland, Revis, Ap. Boreal, p. 238. 3.' 



Female. Length 5-5^ lines. — Black; the clypeus produced and 

 shining, the tips of the mandibles ferruginous ; the disk of the 

 thorax sparingly clothed with rufo-fulvous pubescence, most 

 dense on the post-scutellum and in front of the wings ; the disk 

 shining, evenly punctured ; the tegula) rvifo-piceous ; the wings 

 faintly fulvo-hyaline, slightly clouded at their ai)ical margins, 

 the nervures pale ferruginous ; the legs have a rufo-fulvous 

 pubescence ; the posterior tibiae and tarsi, the intermediate 

 tarsi, and the apical joints of the anterior pair, rufo-testaceous. 

 Abdomen ovate, shining and delicately punctured; at the base 

 a little fulvous pubescence ; on the basal margins of the second, 

 third and fourth segments is a fascia of white pubescence, the 

 first and second fascise usually much attenuated or interrupted 

 in the middle ; on the sides of the anal rima a little fulvous 

 pubescence. B.M. 



Male, Length 4-^-5 lines. — The nose produced as in the other 

 sex, the clypeus having occasionally an obscure yellow spot; 

 the antenucE rufo-testaceous beneath. Thorax : its pubescence 

 very thin and usually griseous, but slightly fulvous on the disk 

 in very recent s}iecimens; the wings as in the female ; the legs 

 also are similarly coloured ; the abdomen elongate-ovate, the 

 bands as in the other sex, but having an additional one on the 

 fifth segment ; the apex fringed with some pale yellowish pu- 

 bescence. ' B.M' 



of Latreille, but the abdominal fasciae are placed on the basal 

 margins of the segmeiits, whereas Walckenaer's insect has them 

 on the a{)ical margins. The male is the Losioglossiim iricingU' 

 lum of Mr. Curtis ; the ])eculiarities in the form of the maxillary 

 lobes, in which it differs from many of the British species, can- 

 not be regarded as of generic value. An examination of a number 

 of species of exotic Hallctiy shows that many, and gradual modi- 

 fications of parts, must be admitted, or this extensive genus 

 would be split into multitudinous subgenera ; at present I prefer 



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