594 PROCEEDINGS OF TEE NATIONAL MUSEUM. vol.46. 



Type of genus. — Dicranotropis heckeri Fieber. 



This genus is related rather closely in many respects to Megamelus. 

 I include in it Van Duzee's genus Pissonotus, which has some fairly 

 good group characters but not enough to warrant the erection of a 

 separate genus. Peregrinus Kirkaldy, erected for maidis Ashmead, 

 is not maintained but merged into this genus, which formerl}^ con- 

 tained that species. 



KEY TO THE SPECIES. 



a'. Frons and clypeus similar in color, or nearly so, latter not darker; usually macrop- 

 terous. 

 6'. Body large; vertex rather broad; branches of frontal carina well separated; 

 membrane veins maculated at apex; male genital styles large, hook-shaped. 



maidis Ashmead. 

 IP. Body smaller, slender; vertex narrow; branches of frontal carina rather close 

 together; elytra maculate at apex; genital styles short, cultrate. 



acbanus, new species, 

 fl'. Clypeus and forecoxse black, making a dark band across breast; brachypterous 

 forms common; antennae rather elongate. 

 6'. Branches of median carina well separated from point of furcation, 

 c'. General color black or very dark. 

 d\ Carinse almost obsolete on apex of head; frons moderately broad. 



marginatus Van Duzee. 

 d^. Carinse distinct on apex of head; frons narrow. 



gi. Pronotum entirely black; elytra brown ater Van Duzee. 



e^. Pronotum white posteriorly; elytra whitish hyaline. 



delicatus Van Duzee (dark form). 



c^. General color brown to light brown or honey yellow; genital styles very small, 



slender; anal tube with two long ventral processes. 



rf'. Frons with more or less conspicuous white, transverse markings, otherwise 



brown; body brown. 



e^. Genital styles broadened, flexed and square at apex; frontal markings 



obscm'ed frontalis, new species. 



e^. Genital styles linear, slightly arched, acute at apex; anal tube processes 



veiy long; frontal markings conspicuous aphidioides Van Duzee. 



cP. Frons without such transverse markings, flavous except apically white; 

 body honey yellow to brown, sometimes black; genital styles as in 



aphidioides delicatus Van Duzee. 



b^. Branches of frontal carina closely approximated, sometimes almost contiguous, 

 c^ Lateral carinae of pronotum extending to hind margin or very nearly so. 

 rf'. Pronotum usually more or less white posteriorly, often almost entirely so; 

 carinas distinct at apex of head ; head very narrow. 

 e^. Body not large; vertex narrow; pronotum seldom entirely white. 



hakeri, new species. 

 e^. Body rather large, broad; vertex broader than above species; pronotum 

 often almost entirely white; genital styles smaller. 



hakeri abdominalis, new variety. 

 d^. Pronotum not whitish posteriorly; carinse indistinct on apex of head; head 



broader pallipes Van Duzee. 



c^. Lateral carinse of pronotum becoming obsolete before reaching hind margin, 

 often considerably before; clypeus and frons only slightly differentiated in 

 color. 



d^. Color piceous brown throughout brunneus Van Duzee. 



d' Color soiled yellowish brown throughout dorsalis Van Duzee. 



