1922] NATURAL SCIENCES OF PHILADELPHIA 259 



same data as the allotype and a female from the Island of Basilan, 

 from C. F. Baker, are before us. 



Xiphidiopsis gemmicula new species. Plate XV, figure 10 ; plate XX, figures 5, 6 and 7. 



This and the following species differ strikingly from the other 

 forms of the genus before us in their smaller size, more slender 

 form, more delicate structure, more contrasting coloration, absence 

 of a cephalic coxal spine and very high specialization of the male 

 supra-anal plate and cerci. 



Though representing a distinct group, we do not believe that 

 they should be separated generically. 



Type: d"; Surigao, Mindanao, Philippine Islands. (From C. F. 

 Baker.) [Hebard Collection, Type No. 827.] 



Size small and form slender for the genus. Vertex with sulcation 

 almost obsolete. Maxillary palpi with last joint equal in length 

 to fourth. Pronotum elongate and slender, the metazona produced 

 caudad and almost as long as the prozona, its surface as convex as 

 in X. drepanophora here described. Lateral lobes of pronotum 

 shallow, the ventro-cephalic angle broadly rounded, the ventral 

 angle less broadly so, the caudal margin strongly oblique with 

 concavity at humeral sinus very weak, but that opposite thoracic 

 foramen decided. Ultimate tergite roundly produced on each 

 side to bases of cerci, deeply and extensively U-emarginate mesad 

 to near base. This emargination is filled by the supra-anal plate 

 which there is flattened, longitudinally weakly bi-sulcate and 

 directed caudad and weakly ventrad; beyond this it is directed 

 ventrad, in a narrower shaft with proximo-lateral margins lamel- 

 late, which, opposite the apex of the subgenital plate, is expanded 

 into a large, rounded apex with ventral surface flattened but convex 

 me?ad, bounded laterad and proximad by high sub-lamellate 

 ridges, which are separated from the median portion by a deep 

 channel. Cercus very large, very highly specialized, proximal 

 section large and globose, about as broad as long, connected with 

 distal portion by a short, thick neck ; distal portion produced ventrad 

 in a very large and delicate lamellate plate, directed mesad, with 

 surface in an oblique plane (the cereal plates so large that they 

 overlap strongly) ; distal portion produced dorsad in a heavy ridge, 

 directed mesad at a sharp angle, the disto-internal portion (or 

 true apex) separated from the ventral plate, directed dorsad, with 

 immediate apex roundly acute-angulate produced and bearing at 

 its caudal base a flattened vertical lobe with outline strongly 

 convex. Above the subgenital plate the yoke of the ultimate 

 tergite is produced as a very similarly shaped plate, but with free 

 margins lamellate, bearing in homologous position to the styles, 

 two processes of the same slenderness but longer, directed ventrad 

 and then curved distad. Subgenital plate small, lateral margins 

 strongly concave-convergent proximad, then subparallel to the 



