1896.] 271 



ON PLAGITHMYSUS: A HAWAIIAN GENUS OF LONaiCORN 

 ^ COLHOPTERA. 



* BY D. SHARP, M.A., T. E. S. 



(^Concluded from page 245). 



Plagithmtsus Dabwinianus, n. sp. 



Gracilis, rufo-Jiavus, antennis fedihusque rufis, femorihus hasi 

 Jlavescente; abdomine nigricante : thorace albido-vittato ; elytris jlavescentihus , 

 singula ad suturam linea angusta albida puhescente, anterius versus latus 

 divergente, liueis his in media plagce nigra positis ; basi dense punctata, 

 lateribus nitidis Icevigatis. Long., 7 — -18 mm. 



Extremely closely allied to P. Blackburni and P. varians, but apparently distinct, 

 and readily distinguished by the clear red colour of the antennas and legs, the latter 

 of which are not ruarked with black : there is a subhumeral dark mark in this species 

 and in P. Blackburni which is absent in P. varians. The flanks of the thorax are 

 usually black ; the yellow colour at the base of the femora is not so definite as in 

 the other two species. 



A very fine series of this species was obtained at Kilauea in 

 August, 1895 ; it is attached to the " Mamane " tree; Mr. Perkins 

 noted it as distinct from C. varians. 



Plagithmtsus Blackbubni. 

 Clytarlus Blackhurni, Sharp, Trans. Dublin Soc. (2), III, 1885, p. 195. 

 Var. a,femoribus rufis, basiflavo, apice nigro. Long., 12 — 17| mm.. 

 Mr. Perkins procured a series of about two dozen examples of 

 this species on Mauna Loa in the Kona district in the autumn of 

 1892 ; they quite agree with the specimens found by Mr. Blackburn. 

 There are only two specimens of the variety with red femora, and 

 they are not connected with the type by intermediate forms. 



Plagithmtsus sulpeubescens, n. sp. 



Niger, thorace albido-vittato, elytris ex parte majore nigris, basi 

 lateribusque fulvo-testaceis, plaga magna cuneata, a sutura nigra anguste 

 divisa, pubescenticB sulphurece ; pectore rufo, sulphur eo-vestita, femoribus 

 rufis, basiflavo, apice nigro, tibiis tarsisque rufo-obscuris, vel nigricantibus, 

 puhe fi,avicante hirsutis. Long., 13 — \^\ mm. 



Allied to P. varians, but readily distinguished from it as well as from P. 

 Blackburni and P. Darwinianus by the broad patch of sulphureous pubescence on 

 the elytra. Antennae black, with very little setosity : head black, with a great 

 deal of white pubescence ; thorax black, with two white sti-ipes along the middle 

 and a more indistinct one on each side. Elytra prettily variegate, the sulphureous 

 mark surrounded with black, and in front of this with only a small rufescent area at 

 the base, the sides are yellow but there is a large black subhumeral mark ; the 



