1922] NATUEAL SCIENCES OF PHILADELPHIA 271 



armed in Hexacentrus. Ventro-internal margin of cephalic femora 

 and ventro-external margin of median femora armed with two 

 large spines and some very small spinulae, the other ventral margins 

 unarmed except for very small spinulae. Caudal femora with 

 ventral margins also armed with fewer but heavier spines than in 

 Hexacentrus (four to five), and with proximo-internal spinulae. 

 Cephalic and median tibiae similar to Hexacentrus, with six pairs of 

 spines, except that those of the cephalic tibiae are heavier and 

 longer, while the median tibiae are unarmed dorsad. 98 



The coloration of annulicornis is distinctive, though very delicate. 



Euhexacentrus annulicornis (Stal). Plate XVII, figure 21. 



1877. H [exacentrus] annulicornis Stal, Ofv. K. Vetensk.-Akad. Forh., 

 1877, No. 10, p. 46. [ 9 , Philippine Islands.] 



Surigao, Mindanao, Philippine Islands, (from C. F. Baker), 1 9 . 



Butuan, Mindanao, Philippine Islands, (from C. F. Baker), 1 9 . 



Lack of material for comparison has apparently led Redten- 

 bacher, Kirby and Karny, into the error of placing annulicornis as a 

 synonym of the very distinct Hexacentrus mundus (Walker). 



This species was originally very poorly characterized and we note 

 the following features, in consequence, in addition to those given in 

 the accompanying generic description, for the female sex. 



Size small for the group. Maxillary palpi with fifth (distal) 

 joint slightly longer than fourth. Subgenital plate slightly longer 

 than broad, with lateral margins convergent and feebly convex 

 to the very weakly bilobate, truncate apex. Femoral genicular 

 lobes with cephalic external bluntly triangularly produced; cep- 

 halic internal, those of median femora and caudal internal strongly 

 unispinose; caucal external strongly bispinose. 



General coloration yellowish buff. Dorsal surface of vertex 

 dark brown. Antennae with frequent elongate annuli of blackish 

 brown. Pronotum with disk suffused with brown, the cephalic 

 and caudal margins there narrowly blackish brown; lateral lobes 

 with a dot of blackish brown mesad on ventral margin. Sides of 

 thorax with a similar dot above insertion of median limbs. Teg- 

 mina pale greenish or green yellow; veinlets, but not veins, delicate 

 vinaceous; a meso-proximal and meso-distal fleck of brown and a 

 series of small flecks along the sutural margin. In the more in- 

 tensive specimen, a series of as decided but smaller flecks also 

 occur along the costal margin. Genicular spines of all femora 

 blackish brown, the genicular area lined ventrad with that color. 

 Limbs with the following blackish brown dots. Cephalic femora 

 mesad with a dorsal, median and ventral dot and distad a median 



98 Though the median tibiae are usually supplied with one or two dorsal spines 

 in Hexacentrus, we have found that presence or absence of such is an individual 

 variation in species of that genus. 



