hiii.mi\: MUBSUII 01 COMPAHATTVI lOftLOGY. 



Labral margin deeplj excavated :it the middle, the black tooth projecting 

 into the incision short, obtuse, leaving most of the incision open Surface of 

 ln-a»l shining; puncta abo^ ■ no1 deep, but toward labral margin 



becoming numerous Antenna] foasa basin-like, closed in fronl as well as 

 behind bj a ridge. Antennae very shorl as usual; attenuated chstad, the 

 sixth article more slender than the more proxima] ones, cylindrical; seventh 

 article short, rounded, with four sensor} oones. 



Collum with anterior margin ooncave a1 the sides and bulging oonvexly 

 forward at the middle, Caudal margin between angles semicircular. Pro- 

 truding median region of anterior border set off by a fine transverse SUlcU , 

 but the latter short, not extending to the side regions. Surface smooth and 

 shining, weak puncta present in a series across anterior border but absent or 

 obsolete elsew hen-. 



Second tergite very large; an anterior elevated border set off by a furrow 

 that is narrow and shallow in the middle region but widens and deepen- down 

 the sides as usual; surface smooth and shining, not punctate. Surface of the 

 other tergites also smooth and shining and without puncta. 



Surface of last plate similar to that of the others. Lower border set off by 

 a very weak oblique depression. 



Tarsus of legs with a single spine above and well separated from the claw. 



Length (female), near 33 mm.; width, 16 mm. 



This species may be easily separated from those heretofore described 

 by the structure of the vulva. In this the basal division is large 

 with the two halves equal or very nearly so, not with the outer one 

 much the larger and overlapping the mesal. The distal piece has the 

 usual triangular form; its base obviously narrower than the width 

 of the basal division; its outer side more oblique than the mesal; 

 dark, strongly chitinous. 



215. Cyliosoma pachygon, sp. now 



Type.— M. C. Z. 4,697. Paratype.— M. C. Z. 4,698. Queens- 

 land: Cooktown, 1896 (A. G. Mayer). 



Color light chestnut of a somewhat ferruginous cast, the anterior plates 

 darker chestnut, the caudal borders of tergites black. Legs pale ferruginous. 

 Head like the tergites but the collum darker, blackish. 



Median emargination of labrum subquadrate, the median tooth narrowly 

 conical, reaching level of mouth of excision. Surface across and above 

 labrum and laterally toward eyes coarsely deeply punctate, but the middle 

 region smooth and shining with the puncta few and small. Antennal fur- 

 rows deep, pit-like, facing directly laterad toward the wing of the second 

 tergite. Antennae short, tapered distad as usual; the terminal article very 

 short, its sensory cones stout and contiguous or subcontiguous. 



