2 24 FAUNA HAWAIIENSIS 



Of this form only two specimens have been received ; they do not agree with any 

 example of M. vagans, but are so near thereto that a series may possibly show that it is 

 not distinct. M. lanaiensis is of the size of the smallest examples of M. vagans, but is 

 paler in colour, the thorax is altogether a little smaller, and the elytra rather narrower at 

 the base so as to be somewhat differently shaped. The specimens are both male. 



Hab. Lanai (Perkins), 2000 ft., January and February 1894. 



(5) Mesothrisciis tricolor, sp. nov. 



Ferrugineus, capite elytrisque nigricantibus, his margine laterali (saepiusque sutura) 

 ferrugineo ; prothorace transverso, basi recta, angulis posterioribus levissime obtusis ; 

 elytris minus profunde striatis. Long. 7 mm. 



This is closely allied to M. vagans, but besides the differences in colour, which are 

 by no means invariable, it differs decidedly in the shape of the thorax and some other 

 details. The basal part of the thorax is flatter, the sides behind being less upturned 

 and less sinuate, with the posterior angles more sharply defined. The elytra are slightly 

 broader and less rounded at the shoulders, their striation usually slightly finer and more 

 regular. The female has only two abdominal setae on each side of the extremity of the 

 last abdominal segment. 



There is considerable variation in the small series of eighteen examples of this 

 species ; the red colour of the thorax being in some cases much infuscate. I also refer 

 as varieties to this species the following two forms. 



Var. coiicolor, van nov. Paulo minor, totus ferrugineus, thoracis ad basin paulo 

 angustiore. Molokai, five examples, W. Maui mountains, two examples. 



Var. rudis, var. nov. Major, praesertim latior, corpore nigro, thoracis ad angulos 

 posteriores lateribus magis elevatis. This variety approaches M. rmiscicola, but the 

 thorax is considerably more transverse. Molokai, two specimens. 



Hau. Molokai. — Maui (as a variety). Molokai, 4000 — 4500 ft., on several occa- 

 sions in 1893 (Perkins). W. Maui, 4000 ft., April 1894. Var. concolor (Perkins). 



No. 1239 of Prof. Thaxter, Laboulbeniaceae. 



I am by no means sure that the var. concolor may not consist of one or two distinct 

 species. The two specimens from W. Maui are very small and have a narrower thorax. 



All the females of typical M. tricolor have, except one, only two setae on each side 

 of the last ventral. The only female of the Molokai M. tricolor concolor has three on 

 each side. The two W. Maui M. tricolor concolor (minor) are both males. 



(6) Mesothrisciis hazoaiiensis, sp. nov. 



Angustior, piceus, antennis rufis, basi palpis pedibusque flavescentibus ; thoracis 

 angulis posterioribus obtusis ; elytris profunde striatis, ad apicem fortius sinuatis, margine 

 laterali ferrugineo. Long. corp. 6| mm. 



Var. Prothorace ferrugineo. 



