100 Mr. T. D. A. Cockerell — Desertions and 



is microscopically tessellate, and the plica on basal half are 

 irregular, many of them imperfect. 



Had. Tambourine Mountain, Queensland, Oct. 27, 1912 

 (H. Hacker). Queensland Museum, 95. 



Allied to H. hedleyi, Ckll., of which only the male is 

 known ; the venation differs conspicuously from that of 

 hedleyi, and 1 do not believe H. cyclurus can be its female. 



The following five species of black Halictus from Tasmania 

 constitute a puzzling series, shown by their microscopical 

 characters to be distinct from one another and from pre- 

 viously described forms. I have named them in memory of 

 men connected with the history of Tasmania. The following 

 key separates them on the microscopical characters : — 



Front finely striate. (Scape minutely punc- 

 tured; niesothorax tessellate, with tine, rather 



close punctures ; area of metathorax with 



minute wavy plicas, from which arise many 



short projections ; abdomen distinctly punc- 

 tured.) It. baudini, Ckll. 



Front with irregular minute labryinthiform 



wrinkles. (Mesothorax tessellate, with very 



minute sparse punctures ; area of metathorax 



very finely plicatulate, the ridges partly 



anastomosing, reaching fully three-quarters 



distance to margin, the surface between the 



plica? minutely tessellate ; abdomen finely 



lineolate, with only very minute piliferous 



punctures ; hind spur of $ with a few stout, 



not very long teeth.) H.furneauxi, Ckll. 



Front densely punctate, so densely as to 



appear minutely cancel! ate 1. 



1. Area of metathorax with strong irregular 



plicse, confined to basal half, but the surface 



minutely lineolate-reticulate, the more di- 

 rectly continuous lines running transversely. 

 (Mesothorax rough with a minute tessella- 

 tion, and finely but rather closely punctured.). H. boweni, Ckll. 

 Area of metathorax plicate or reticulate over 



most of the surface 2. 



I. Mesothorax dull, the disc minutely regularly 

 tessellate, with widely separated minute 

 punctures ; at sides the punctures are rela- 

 tively large and dense, with the intervals 

 finely striate-wavy. (Area of metathorax with 

 coarse, irregular, labyrinthiform wrinkles, 

 more trausverse than longitudinal ; abdomen 



distinctly punctured.) H. blighi, Ckll. 



Mesothorax shining, the disc with the surface- ^ 



markings irregular and the punctures, espe- 

 cially posteriorly, rather large and tending 

 to be bordered by plicae, or the punctures 

 may be more or less confluent. (Area of 

 metathorax coarsely irregularly reticulate; 

 abdomen well punctured.) H. bassi, Ckll. 



