BY FREDERICK A. A. SKUSE. Ill 



posterior cell in punctiform contact with the discal (before the 

 middle of its length) ; seventh longitudinal vein tolerably long, 

 only slightly arcuated at the tip. 



This genus may very likely be more closely related to Hahro- 

 mastix and Phymatopsis than to the genera with which it is 

 perhaps arbitrarily classed at present. 



414. AcRACANTHA Sydneyensis, sp.n. (PI. V., fig. 16.) 



(J. — Length of antennae 0-120 inch ... 3*04 millimetres. 



Expanse of wings 0-500 x 0-120 ... 12-70x3-04 



Size of body 0-500x0-065 ... 12-70x1-66 



Q. — Length of antennae 0-120 inch ... 3-04 millimetres. 



Expanse of wings 0-690 x 0-170 ... 17-51 x 4"31 



Size of body 0-800x0-090 ... 20-32x2-27 



Head rich reddish-brown ; the anterior portion of the front, 

 face, rostrum and both joints of scapus reddish-fulvous ; nasus, 

 palpi and flagellar joints black ; antennae about twice the length 

 of head ; first joint of scapus rather long, cylindrical, about four 

 times the length of second; in ^ first seven, in ^ first six, flagellar 

 joints (viewed from the side) truncate-clavate, flattened above, 

 produced beneath, (giving to the antennae a distinctly serrate 

 appearance), progressively diminishing in depth ; the remaining 

 joints (three in ^, six in <^) linear, beset with long bristly hairs. 

 Collare bright pale yellow. Thorax brown, somewhat shining, with 

 more or less distinct traces of paler longitudinal stripes ; pleurae 

 with bright pale yellow stripe continuing from collare to base of 

 halteres ; scutellum and metanotum paler than the mesothorax. 

 Halteres brown. Al)(lomen brown, the first two segments (in the 

 (J), margins of segments and venter, more or less fulvous-brown ; 

 genitalia fulvous or brownish-fulvous. Coxse fulvous. Femora 

 fulvous, growing brown towards the tip. Tibise and tarsi dark 

 brown, the former fulvous at the extreme base. Tarsi in the fore 

 and intermediate legs at least twice the length of tibiae, in the 



