1 30 



oncl segment of the antennae, it differs from P. cervina by the 

 radial and brachial veins of the tegmen being- forked at about 

 the same distance from its base, while in P. ccrvina the radial 

 is forked much nearer the base. I still further supplement Dis- 

 tant's superficial descriptions by figures of the male genitalia ; 

 male pygophor of irregular shape, very deeply and elongately 

 emarginate ventrall\- : the anal tube forms a kind of hood, cover- 

 ing over the genital stves. which are acutelv elongate. (PI. XV. 

 figs. 6-8). 



Proterosydyne, gen. nov. 



Distinguished by the absence of connecting keels on the ver- 

 tex, the very large eyes, and the peculiar tibial spur. 



Vertex subtriangular (the anterior and posterior halves of the 

 lateral margins very obtuse angled, so that, although the vertex 

 is really 5-hedral. it may be said to be triangular), with no me- 

 dian or connecting keels; lateral keels not quite contiguous api- 

 cally. almost enclosing an elongate exceedingly narrow space be- 

 fore uniting about the apical margin (frontally) of the eyes. 

 Between the apex of the vertex and this forking, the head is 

 highly polished and the keels rather obscure, otherwise the keels 

 are all well marked. The median keel reaches the apical margin 

 of the frons, which is a little emarginate roundedly. Vertex 

 deeply concave, about as long as wide and docs not extend as 

 far anteriorlv as the yes, thus displaying a rounded frontal mar- 

 gin. Frons rather narrow, elongate, subparallelsided. slightly 

 rounded exteriorly. Middle keel of genae meets lateral margins 

 of frons at an acute angle at the apical margin of the frons ; 

 clypeus rather feebly tricarinate. Head not decumbent on the 

 pronotum anterolaterally. Eyes very large, about as wide as 

 vertex, longer than wide. Antennae subcylindric. long, reaching 

 almost to apex of clypeus, second segment scarcely more than 

 twice as long as the first, a little wider apically than basally, 

 fiagellum much longer than peduncle. Pronotum longer than 

 vertex, narrower apically than the vertex basally. strongly tricar- 

 inate. lateral keels straight, reaching posterior margin, not conti- 

 guous anteriorly ; pctsterior margin slightly, obtuse-angularly. 

 emarginate posteriorlv. Scutellum with anterior three-fourths oi 

 disk roundly convex and polished. i)osterior fourth flat, rather ob- 

 scurely tricarinate, middle keel not reaching the flat part. Teg- 

 mina (brachypterous form only known) granulate, reaching be- 



