371 



Readily distinguished from 0. splicer aides, Pasc, by the 

 rows of tubercles on the elytra and by its rougher surface. 

 Otherwise in size and form the two species are very similar. 

 Type in author's collection. 



Byrsax coxi, n. sp. 



Oblong, convex ; reddish-brown, antennae and tarsi red, 

 upper-surface clothed with short tornentum. 



Head with two nearly straight, diverging horns, finely 

 serrated at base on the inside, on apical half on the outside 

 edge ; antennae short, apical four joints strongly transverse. 

 Prothorax sharply raised in middle, with two prominently- 

 raised branching tubercles on middle anterior, two large 

 tubercles behind these, and other smaller conical tubercles 

 irregularly scattered on disc ; margins wide, their edges deeply 

 toothed. Elytra of same width as prothorax at base; humeri 

 prominent toothed and advanced, the edges finely and closely 

 dentate throughout; margins rather wide in front, obsolete at 

 apex ; seriate punctate, the series close, the punctures large and 

 round, the intervals with conical tubercles irregularly placed. 

 Under-side rugose punctate. Dimensions — 5 x 2'5 mm. 



Ha b.— Sydney ("H. Cox). 



A single male was generously given me by its discoverer, 

 and differs from B. pinna ticollis, Cart., in its narrower form, 

 straight horns, larger elytral punctures, and its dentate not 

 crenulate sides of prothorax and elytra. Type in author's col- 

 lection. 



Pterohel.eus denticollis, n. sp. 



Elongate, subparallel, depressed; black, moderately nitid ; 

 palpi, antennae, and tarsi piceous-red. 



Head — Labrum emarginate ; epistoma truncate with corners 

 rounded, forming a sinuous curve with canthus ; suture limited 

 to two oblique impressions at the sides; space between eyes 

 about the length of third antennal joint; rather finely punc- 

 tured, with three larger punctures on forehead ; antennae 

 robust, just reaching base of prothorax; joints 3-6 obconic, 3 

 as long as 4-5 combined, 7-11 gradually enlarged, the three 

 penultimate transversely oval, 11 as long as wide. Prothorax 

 5 x 10 mm. (length measured in the middle), widest near base, 

 arcuate-emarginate at apex, the anterior angles strongly 

 produced outwards into an acute tooth; sides sinuate behind 

 tooth, then arcuately widening till near the posterior angle, 

 this forming a short acute tooth produced backward ; base 

 bisinuate ; lateral margins widely explanate, extreme border 

 narrowly reflexed at sides and apex ; disc with some large and 

 small punctures irregularly scattered, and five foveate impres- 

 sions — two lateral elongate, two basal irregular, and a faint 



