170 THE ENTOMOLOGIST. 



over the whole of the surface of the second segment ; in Calypto- 

 proctus a part of the surface is smooth ; in Dictyophara and 

 Cixius the nodes are far fewer in number, but very similar in 

 structure, though the sensory-lobes are fewer also in number. In 

 Eurijhrachys, Calliscelis honellii, and Issiis coleoptratns, the surface 

 of the second segment of the peduncles is strewn with numerous 

 small pointed nodes and a number of bristles ; the sensory 

 organs are fewer in number in tlie two last-named genera (pi. i. 

 f. 14 and 13), and in all three genera they lack the protectmci ring 

 of cJiitinous pegs, while the lobes in each organ are numerous in 

 Euryhrachys, far fewer in the two other genera (f. 13 a). In a 

 Ricania sp. the second segment of the peduncle is of scarcely 

 greater magnitude than the first ; the sensory organs are 

 situated only on the terminal face, are few in number and small 

 in proportion (pi. i. f. 15). They are distinguished by each one 

 possessing only one or two lobes, while their margins are bent up 

 in peculiar ear-shaped processes, outside each of which there is a 

 conical spike. In Poeciloptera phalcenoidesi (pi. i. f. 16, 16 a) the 

 sensory organs are still smaller in size, but are very similar in 

 appearance to Ricania, though not so clean cut. The sensory 

 lobes number only one or two. In Tettigometra costidata (pi. f. 

 17) the second segment of the peduncle is proportionately very 

 large, and so oblique that the flagellum is articulated far from 

 the apex on one of the sides. The sensory organs are pro- 

 portionately very numerous and large ; the protecting circlets of 

 chitinous pegs are (as in Issus) wanting ; but the rest of their 

 structure is very obscure. Apparently all of the almost circular 

 sensory areas are each covered (f. 17 a) with a thin membrane, 

 which is extremely finely punctured, and on which there are 

 usually one to four irregular elongate shallow keels, which thus 

 agree with the lobes in the previously described Fulgoridse. In 

 the Delphax group (of which I have examined Arceopus crassi- 

 cornis, Megamelus notula, Stenocaremis minutus, and Liburnia 

 limhata), one meets with a structure singularly characteristically 

 distinguishing it from the other Fulgoridae. The second segment 

 (pi. ii. f. 1) is strewn with isolated large bristles and numerous 

 small bristles, and the sensory organs are, in proportion to the 

 size of the insect, rather numerous and very conspicuous. The 

 chitinous pegs in the circles surrounding each organ are 

 strikingly few in number, and of a considerable size (pi. ii. f. la) ; 

 instead of sensory lobes there are on the membrane within the 

 circles oiily bristles, which in Stenocarenus and Megamelus differ 

 but little either in form or size from the small bristles strewn on 

 the remainder of the surface of the segment, except that those 

 lying within the circles are noticeably thicker than those without, 

 while in Liburnia they are far thicker, somewhat shorter and 

 coarser, and far more curved than the normal small bristles ; 



