70 ENTOMOLOGICAL SOCIETY 



than the stem, terminating obliquely upon the costa and two and one-half 

 times shorter than the second furcal, with which it forms an oblique an 

 gle ; second furcal gently curved throughout its length and terminating 

 obliquely upon the costa; third furcal slightly shorter than the fourth, 

 which is about as long as the second furcal ; radial cell slightly narrower 

 than the discoidal cell, which is nearly of the same width as the cubital 

 cell, the latter not narrowed at middle; margin of anterior basal cell flat 

 tened out, limited internally by a fine vein ; brachium reaching the apical 

 corner of the posterior basal cell. 



<$ Genital segment very large, completely dividing the sixth ventral seg 

 ment, honey-yellow, plate and forceps usually darker ; genital plate longer 

 than the segment, perfectly straight, about three times longer than wide, 

 not narrowing apically, broadly rounded at tip; forceps much narrower 

 and but little lower than the plate, its front edge slightly concave at basal 

 half and convex at apical third, its posterior edge nearly straight, tip acute 

 and pointing backward. 



9 Only four ventral segments are visible in addition to the genital seg 

 ment; the latter consisting of two very short plates which (at least in 

 dried specimens) do not meet; upper plate as long as the preceding ventral 

 segment, either horizontally projecting or declivous, broadly rounded at 

 tip, lower plate only half the length of the upper one, i-apidly narrowing 

 into an extremely small acute point, lower edge convex. 



Length (to tip of wings) 3.50-4 mm. 



Described from several specimens collected by Mr. Albert 

 Koebele on Eucalyptus leucoxylon in Australia (probably South 

 Australia) . Specimens typical of the above description are in 

 the U. S. National Museum (collection Department of Agricul 

 ture), No. 3793. 



The genus Spondyliaspis differs from all Psyllid genera known 

 to me by the peculiar structure of the hind tibiae and hind tarsi, 

 and since it seems to me that these characters possess more than 

 generic value, the erection of a new subfamily, Spondyliaspinas, 

 of the true Psyllidae (as contrasted with the Liviidae) is proposed 

 for this genus. The tarsal peculiarity has already been observed 

 by Dobson, who refers to it in the following words : "The feet 

 are furnished with two hooks and a small membranous bladder. 

 These vesicular appendages, as well as the antennas, are con 

 tinually in motion." In the dried specimens the cushion-like 

 expansion of the hind tarsus is probably much less conspicuous 

 than in the living ones. In the shape of the body this genus 

 bears a considerable resemblance to the genus Flohria Lrew, of 

 the tribe Psyllini. 



There is, of course, considerable doubt as to the specific 

 identity of this species with Dobson's Psylla eucalypti, the 

 imago of which is described only' in a general way, but I am 



