X, D, 6 Funkhouser: Review of the Philippine Memhracidx 367 



Fig. 1. Fore and hind wings of Tricentrus fair-.- 

 mairei Stal. a, discoidal cells ; 6, apical cells ; 

 c, internal angle. 



in some cases are of consider- 

 able length. To supplement 

 this, a complete bibliography 

 of all of the references cited is 

 given at the end of the paper. 



NOMENCLATURE 



Some of the terms men- 

 tioned in the following de- 

 scriptions and a few of the 

 characters used in the generic 

 and specific diagnoses are 

 more or less peculiar to the 

 family and should perhaps be 

 briefly explained. The term tegmina is used throughout for the 

 forewings, following Stal, Fowler, Coding, Van Duzee, and other 

 authors. In this wing the discoidal areas (the inclosed cells 

 in the center of the wing) and the terminal or apical areas 

 (the cells reaching the apical margin) are frequently used, but 

 are not entirely reliable characters (fig. 1, a and b.) The 

 clavus is the narrow posterior portion at the base of the teg- 

 men which is next to the scutellum when the wing is closed. The 

 internal angle of the tegmen is the angle made by the union 

 of the clavus with the corium at the internal margin, usually 

 about two thirds of the distance from the base to the tip (fig. 

 1, c). The terminal areas of the hind wings have proved 

 valuable taxonomic characters, but unfortunately are hard to 

 determine in dried specimens without relaxation. If the speci- 

 men is fresh, however, no difficulty is experienced in the use of 

 this character, and even in dried specimens the tegmen may 

 usually be lifted far enough to expose the tip of the underwing 

 without damage to the insect. The sides of the pronotum above 

 the eyes are usually swollen or produced into humeral angles 



Fig. 2. Front and lateral outline of Tricentrus fadrmairei Stal. a, humeral angles ; 6, supra- 

 humeral horns ; c, metopidium ; d, clypeus ; e, posterior process. 



(fig. 2, a). Above these angles arise the suprahumeral horns 

 (fig. 2, b). The front of the pronotum between the suprahu- 



