544 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 90 



claws of the female are bifid ; in the male there is a hairy plate where 

 otherwise the imier tooth is situated. 



Genotype. — Sinotocyphus chineivsis, new species. 



SINOTOCYPHUS CHINENSIS, new species 



Figure 23 



Black with extensive yellow markings on head and thorax ; wings of 

 female j'^ellow with fuscous apical half, of male fuscous with hyaline 

 base. The entire insect shows a brownish-golden appressed pubes- 

 cence, with a few short hairs, which are pale on the head and lower 

 pronotum and dark at the apex of the abdomen. . 



Female. — Head black, with yellow vertex, front, face above the an- 

 tennae, and narrow outer orbits ; a yellow line between the antennae 

 as well as one on each side of base of antenna leading down to base 

 of clypeus. Two small yellow spots on the base of the clypeus in 

 two of the specimens sliovv- that a certain amount of variation in 

 coloration is to be expected, indicated also by the more or less brown- 

 ish tinge on clypeus and labrum. Mandibles brown ; antennae chest- 

 nut-brown below, fuscous above. Pronotum on its upper surface 

 yellow with exception of shoulders, one specimen showing considerable 

 shrinkage of yellow area; on one specimen a prolonged rectangular 

 yellow spot on mesonotum reaching from the hind border two-thirds 

 of its length in front; scutellum and postscutellum in this case also 

 partly yellow. In other specimens all those yellow spots gradually 

 disappear, and one specimen shows no trace of them. Abdomen and 

 legs black with traces of brown on the legs, the front legs especially on 

 the inner side showing a light-brown coloring. Wings fuscous- 

 yellow with brown veins, the darker part of the front wing fading 

 into the yellow of the base gradually, reaciiing into the first cubital 

 cell and the apical tip of the first discoidal cell and covering all 

 the third discoidal cell. In the hind wing the darkening is less 

 pronounced; it fills the apical half, merging very gi-adually with 

 the yellowish base of the wing. 



Face rather long and narrow; eyes slightly emarginate; vertex 

 elevated behind ocelli, which are placed high up on front ; hind ocelli 

 nearer to eyes than to each other ; front ocellus somewhat larger than 

 the two others and separated from them by its diameter. Middle 

 part of front above base of antennae elevated and cut by a deep nar- 

 row line, which reaches upward from between the antennae half the 

 distance to lower ocellus. Clypeus twice as broad as high, truncate 

 at apex ; labrum more than twice as broad as long, rounded ; mandibles 

 with a ver}^ inconspicuous small tooth on their inner side far back. 

 Pronotum moderately prolonged, curved forward with mesonotum; 

 scutellum and postscutellum elevated ; propodeum as long as pronotum. 



