116 bulletin: museum of comparative zoology. 



nearly to the keel on each side. Surface more or less punctate and moder- 

 ately coriariously roughened, more especially behind the sulci. Posterior 

 angles of keels in posterior region extended caudad distinctly beyond caudal 

 margin of tergites. In lateral view the keels narrowing or decreasing in 

 thickness triangularly caudad, but the posterior angle narrowly rounded, much 

 less acute than in S. robustior than wliich it is a very much smaller species. 



The Cauda of the anal scutum flat, concave beneath, extending a smaller 

 distance than usual beyond the valves. 



Length, 21.5 mm.; width, close to 3 mm. 



This species, as in the case of robustior, is, in the absence of knowl- 

 edge of the males, referred with some doubt to Strongylosoma. 



324. Strongylosoma robustior, sp. nov. 



Type.— M. C. Z. 4,656. Paratype.— M. C. Z. 4,657. New 

 South Wales: Blue Mts., Katoomba (W. M. Wheeler). 



The color is darker, being above chocolate-brown or in .part (anteriorly and 

 posteriorly) black, the sides and venter paler, fulvous. Anal scutum with 

 caudal end ferruginous or fulvous. Legs distally hght brown and proximally 

 fulvous, instead of red as in the other species. 



Lateral ends of collum rounded. Strongly margined laterally. Above 

 margining sulcus a little coriariously roughened. 



Surface of the other tergites nearly smooth, a few weak, irregular longi- 

 tudinal sulci and some finer ones giving a vague coriarious appearance. No 

 longitudinal median sulci but a deep transverse sulcus on each tergite from 

 the fifth to the eighteenth, the sulcus extending nearly to the keel on each side. 

 Keels of second segment well below the others as usual, the anterior corner of 

 each not produced, subrectangular, the posterior corner rounded. Other 

 keels low but distinct throughout length, set off above by a sharply defined 

 longitudinal sulcus. Keels of porigerous segments much thicker than the 

 others as usual, but narrowing to an angle behind, the ventral margin running 

 obhquely dorsocaudad to meet the upper one. Pore caudad of middle. 

 Posterior angles not produced caudad of caudal margin of tergites. 



Pleural keels are present on the second, third, and fourth segments, whereas 

 in S. rubripes they occur only on the second and third; the keel of the second 

 segment much lower down than the other two. Above level of each leg of 

 fourth segment a low, stout, distally truncate process. On succeeding seg- 

 ments a slender process above base of each first leg and a stouter lower one 

 above base of the second leg. 



Anal scutum with cauda long, wide, concave beneath, caudal margin mesally 

 excised. Valves strongly margined; each with two long setae. Anal scale 

 caudally convexly rounded; with the usual two long setae. 



Length (female), near 42 mm. ; width, 4.6 mm. 



