100 SUBANTARCTIC ISLANDS OF NEW ZEALAND. [CoUofUra. 



One individual, forwarded by Mr. G. V. Hudson. As the specimen was simply 

 gummed on cardboard so that the legs, antennae, &c., were invisible, the prepara- 

 tion of the foregoing descriptions, generic and specific, was a work of more than 

 ordinary difficulty. The insect had to be removed from the cardboard and thoroughly 

 cleaned and freed from gum and sappy matter before any structural characters 

 could be studied, and as it is small and convex, and the antennae, tarsi, &c., rather 

 fragile, these were very delicate and tedious operations. Duplicates should always 

 be supplied in the case of small insects, so that one may be mounted on its back. 



Thomosis, Broun, 1903. 



Body oblong-oval, convex. Antennae 9-articulate, their basal joint longer than 

 the following 5 combined, gradually incrassate towards the extremity ; 2nd cylindric, 

 barely one-third the length of the basal ; 3rd as long as the preceding one ; 4th 

 and 5th short ; 6th also short, but distinctly broader than the 5th. Cluh 3-jointed, 

 oblong-oval, pubescent, the intermediate transverse and shorter than the others. 

 Labrum porrect, medially emarginate. Epistome widely incurved in front. Eyes 

 flat, smooth. Mentum large, flat, not transverse. Femora punctate, their punctua- 

 tion closer and finer at the base than beyond it ; the intermediate distinctly pubes- 

 cent, the posterior with minute, almost indistinguishable, pubescence. Tibiae stout, 

 the anterior armed at the extremity with 2 stout unequal spurs, with 2 small sub- 

 apical denticles on the outside, and 2 or 3 higher up ; the other pairs are bicalcarate 

 at the apex, and bear coarse ciliae. Tarsi moderately elongate, not compressed, 

 pilose ; the exposed portion of the basal joint of the posterior short, hardly more 

 than half as long as the 2nd, which is rather longer and stouter than the 5th. 

 Anterior coxae very large and prominent, contiguous, the middle pair widely separated. 

 Sternal lamina large and plane, tapering from the base of the metasternum to beyond 

 the intermediate coxae. Mesosternal process vertical and short, its suture curvate. 



Nearly allied to the New Zealand Hydrostygnus, but may be readily distinguished 

 therefrom by the large prominent coxae. The antennae differ, the club is shorter 

 and broader, the maxillary palpi are much thicker, and the mentum is altogether 

 different. 



Thomosis guanicola, Broun, 1903. 



Nude, moderately nitid, nigro-piceous, the legs and lateral margins pitchy-red, 

 palpi and antennae usually testaceous ; tarsi, labrum, and forehead rufescent. 



Head not half the width of thorax, longer than broad, narrowed anteriorly, 

 closely and moderately finely punctured. Thorax almost twice as long as broad, 

 regularly curvedly narrowed towards the front, lateral margins moderately developed, 

 its sculpture like that of the head, sometimes with 2 small frontal foveae. Scutellum 

 triangular. Elytra closely and finely pimctate, and with 10 series of distinct but 

 not coarse punctures on each, the sutural, at the apex, almost form striae. 



Underside nigrescent, mostly densely and finely sculptured, with short incon- 

 spicuous dark-ashy pubescence. Abdomen with 5 segments, the intermediate 3 

 nearly equal, the basal subcarinate along the middle. 



Length, 3^ lines ; breadth. If lines. 



Bounty Islands. 



Three specimens, found by Dr. L. Cockayne feeding amongst deposits of guano. 



