128 
TRICHOPTERYGID. 
very long, with the basal segments membranous. Prosternum large; episterna large, trigonal; epimera 
moderate, rather broadly enclosing the coxal cavities. Mesosternum moderate, not carinated ; episterna 
very large; epimera very large and broad, extending to the coxal cavities. Metasternum rather short, 
transverse, extending to the sides of the body; episterna long, with their interior angle alone visible 
beyond the margin of the elytra; epimera very narrow and long, with their extremities visible beyond 
the metasternum. Venter composed of six nearly equal segments, with apical segment simple. Legs 
generally long and robust; coxee faintly laminate; tibie generally armed with long spurs and sete; tarsi 
3-jointed, with the apical joint very long and slender. 
The species of Péinella are distinguished from the rest of the family by their elegant 
elongate shape, small and generally constricted thorax, and by the bright yellow or 
orange colour of the body; the latter in the female is more or less suffused with casta- 
neous, and exhibits the wings in the form of longitudinal black vitte beneath the 
transparent elytra. All are subcortical in their habits. 
Numerous species of this genus are known from Europe, North America, Madeira, 
&e. 
The three Central-American species here enumerated are separated from each 
other by the following superficial characters :— 
Integument coriaceous and flexible. 
Size rather large, form broad. . . . . . 1. ee.) ehampionana. 
Size small,form narrow. . . . . . . . . ee pellucida. 
Integument harder, and more corneous . . . . . . .) ..SCincerta. 
1. Ptinella championana. (Tab. III. fig. 22.) 
Ptinella championana, Matth. Trans. Am. Ent. Soc. xi. p. 116+. 
Hlongato-ovalis, depressa, sat nitida, flava, translucida, pilis brevissimis flavis vestita; capite magno, antice sat 
acuminato ; oculis parvis, prominentibus ; pronoto brevi, quam caput breviore sed parum latiore, ad medium 
latissimo, ad basin fortiter et abrupte constricto, tuberculis minutis remotis interstitiisque glabris, nitidis, 
ornato, interdum depressione lata indistincta in disco notato, lateribus marginatis, antice valde rotundatis, 
ad basin abrupte constrictis, margine basali fere recta, angulis acutis valde prominentibus ; elytris brevibus, 
quam caput atque pronotum multo brevioribus et haud latioribus, prope media latissimis, ordinibus trans- 
versis remotis modice asperatis, interstitiis glabris, nitidis, apicibus rotundatis; abdomine longo, obtuso, 
segmentis quinque expositis, lateribus profunde marginatis ; pedibus atque antennis modicis, flavis. Long. 
corp. 3°; lin.=1:12 millim. 
Head large, convex, rather pointed in front, ornamented with minute remote tubercles; eyes small, rather 
prominent; antenne moderate, yellow. Thoraa short, shorter but rather broader than the head, widest 
at the middle, strongly and abruptly constricted near the base, ornamented with minute remote tubercles, 
with the interstices smooth and shining, occasionally with a broad indistinct depression on the disc; sides 
margined, much rounded in front, and constricted near the base; basal margin nearly straight, with the 
angles acute and very prominent. Scutellum large, triangular, deeply asperate. Hlytra short, much shorter 
and not wider than the head and thorax, widest near the middle; moderately asperate in remote transverse 
rows, with the interstices smooth and shining; apex very much rounded. Abdomen long and obtuse, with 
five segments exposed, deeply margined at the sides. Legs moderate, yellow. Underparts wholly 
testaceous. 
Hab. Guatema.a, El Reposo 800 feet (Champion 4), 
Differs from the European P. testacea in its shorter and more abruptly constricted 
thorax, very short elytra, and shorter legs and antenne. 
Found in numbers under sappy bark in the low hot forest-region of the Pacific slope. 
