;{ji ANimiOMiKi:. 



imbesceiico ; Uu- in.'iiuUblos fornigiiious ; (lio llagcllinn of the iin- 

 tonnic fulvous bcuoalh. Thorax closely punctured; tlic meta- 

 thonix Inielv ru-uloso at llio l.aso, Mio margin of the truncation 

 smoolh and'shining; wings hyaline, the legiihc and ncrvures i)alo 

 rufo- testaceous; legs rufo-piceous, with the tarsi rufo-tostacoous. 

 Abdomen with a sliort palo pubescence, the apical margins of the 

 segments palo testaceous. 



//(f/', Mexico, Oajaca. 



This species closely resembles H. titmulonnu of Europe. 



25. Halictus politus. 



Fnni(f,'. Length 4^ lines.— Black ; head and thorax opaque, ab- 

 domen shining. Head very closely punctured and thinly covered 

 with hoary pubescence ; tips of the maudildes rufo-piceous. The 

 mesotliorax and scutellum very closely punctured; the postscu- 

 tellum and sides of the metathojax with pale ochraceous jmbes- 

 ccnce; tho base of the metathorax irregularly longitudinally 

 sti-iated and posteriorly truncate; wings pale fulvo-hyalinc, the 

 ncrvures pale rufo-tcstaceous ; the legs with dark fuscous pubes- 

 cence. Abdomen obscure reddish brown, with a band of pale 

 tomeutum on the basal margins of the second, third, and fourth 

 segments. 



Male. Has a close resemblance to the female: the apex of tho 

 clypeus yellow, the head and thorax opaque, the wings with a 

 fuscous cloud at their apex ; the abdomen banded as in the female. 



J I (lb. ilexico, Oajaca. 



26. Halictus desertus. 



Female. Length 3| lines. — Black ; head and thorax opaque, ab- 

 domen shining. Head rotnndate, the clypeus very slightly pro- 

 jected ; very closely and finely ])unctured ; the face and cheeks 

 with thin hoary pubescence. Thorax closely and finely punctured, 

 having thin hoary pubescence ; the base of the metathorax very 

 finely rugulose ; wings subhyaline, the ncrvures testaceous, the 

 tcgulse shining black ; the tibia) and tarsi with pale fulvous pubes- 

 cence. Abdomen shining and very finely and very closely punc- 

 tured ; the basal margins of the second, third, and fourth segments 

 with bands of whitish tomentum. 



Ilale. About the same length as the female, but more slender ; 

 the head opaque ; the apical haK of the clypeus white, smooth, and 

 shining. Thorax closely punctured, slightly shining ; the meta- 

 thorax with irregular fine striae; wings hyaline and iridescent, 

 slightly clouded at their apical margins. Abdomen oblong, and 

 banded as in the female. 



ifab. Mexico, Oajaca. 



