OF WASHINGTON, VOLUME XIX, 1917 109 



reddish; apical half of sixth segment reddish, the margin crenulate; last 

 ventral segment hardly surpassing last dorsal; ventral segments strongly, 

 closely punctured, depressed apical margins translucent, preceded by a 

 reddish band. 



Type locality. Ramsey Canon, Huachuca Mts., Arizona. 



Type, Cat. No. 21837, U. S. N. M. 



Described from one female taken by Dr. W. AL Mann, after 

 whom it is named. 



Differs from S. australis in being larger and more robust, in the 

 crowded punctures of head and mesonotum, the yellow band back 

 of ocelli, 'the translucent apical margins of abdominal segments, 

 preceded by the reddish stripe, the close punctures of ventral 

 segments three and four, etc. S. australis has the apical margin 

 of sixth segment more toothed than crenulate but medially there 

 is a truncate projection medially emarginate. 



Halictus. 



The following key can be used to separate the females of the 

 Philippine species of Halictus known to me: 



1. Green taclobanensis Ckll. 



Black 



2. Tibiae yellow manilae Str. non Ashm 



Tibiae black ..3 



3. First abdominal segment with distinct strong punctures 5 



First abdominal segment impunctate or punctures microscopic 4 



4. Larger (over 8 mm.) with strong bands of appressed pubescence on 



bases of segments and on apical margins of 3 and 4. . . .innnil/n' Ashm. 



Smaller, slender (about 6 mm.) with at most weakly indicated bunds 



on margins of segments nesiolii* n. sp. 



5. First abdominal segment sparsely punctured, the apical margin im- 



punctate phili i>i>i iti'nxix Ashm. 



First abdominal segment including apical margin closely punctured. . 6 



6. Medial anterior margin of mesoscutum reflcxed and carinat.- 



bagnio/lift n. sp. 

 Medial anterior margin of mesoscutum not carinate. .hainilnnmix Ckll. 



Halictus nesiotus new species. 



I-i innlr. Length about G mm. Black, with sparse whitish pubescence 

 on head and thorax; face finely lineolate, clypeus with scattered large 

 punctures; punctures on sides of face shallow, well separated; those on 

 front finer, deeper; mesoscutum strongly lineolated and sericeous with 

 fine punctures separated by about twice a puncture width; scutellum with 

 a few scattered very fine punctures; propodeum without an enclosure, the 

 I' ise with a few rugulae not reaching apex, rest of surface finely indistinct I \ 



