216 Journal New York Entomological Society. [Voi. xxvi. 



myself (Trans. Ent. Soc. London, 1912, p. 571, pi. LXXVI, f. 223) 

 where the sac is not extended, and consequently is only imperfectly 

 shown; those of Ithyccriis I believe are quite unknown, and I give 

 below the best sketch I can manage from the material at my disposal, 

 and for which I am much indebted to Mr. C. W. Leng. The illus- 

 trations accompanying are due to Mr. and Mrs. F. Muir. 



The male characters. — On superficial inspection of the abdomen 

 six segmental plates are visible ventrally, that is one more than is 

 usual in Rhynchophora. On dissection, however, it is seen that the 

 apical one is really a part of the dorsum. This has already been ex- 

 plained by Dr. G. H. Horn, and will readily be understood by looking 

 at our Fig. i. In Bcliis the arrangement is similar except that the 

 last segment is withdrawn into the penultimate one. Extraordinary 

 as is the last dorsal plate the corresponding ventral (Fig. 2, VIII) is 

 even more remarkable. It is reduced to an undivided, sinuous, half- 

 ring, very hard, and prolonged in the middle in the anterior direction 

 as a short strut, above which reposes the fork of the speculum which 

 is like a Y with a very long stalk, and on this fork there is a fold of 

 membrane, having on each side a slender streak of chitin (.r in Fig. 

 4) ; just beyond and between the fork and the rods is the distal ex- 

 tremity of the genital tube — the genital orifice. Owing to this dis- 

 position of the parts of the last segment, the anal and genital orifices 

 are placed in a cleft anteriar to the termination of the body instead 

 of at its extremity as usual (Fig. 3). 



The asdeagus (Figs. 6 and 7) is very remarkable; the delicate 

 membrane that forms the apical part of the genital tube is of unusual 

 elongation, and permits the asdeagus to be withdrawn far into the 

 body, the tip of the median lobe (the so-called "penis") being then 

 2.5 millimeters away from the spot where it finds exit. This mem- 

 brane being severed and removed, the sedeagus can be taken out and 

 then, in its contracted form, presents the appearance shown in Fig. 

 6, the outer part being the tegmen {t f. 6) through which the median 

 lobe plays {ml) : this tegmen is of peculiar form; the bridge (dorsal 

 part, or cap-piece) consisting of two chitinizations connected into 

 one piece by strong membrane, but each projecting distally as a long, 

 free, illiate lobe, with a U-like space between them; the strut (ts) 

 ventrally placed is long and nearly straight and the sides forming its 

 fork are large and continued dorsally as the lobed plates of the cap 



