MORGAN HEBARD 
331 
generic. Hence VJnx falls for the older Praos. The following 
comparison of perditus and c/mm/riom shows their affinity, and the 
characters here given may be considered diagnostic for the genus 
Pj'oos. 
Tegmina fully develojied (chornpioni) or abbreviated (perditus) , vrith costal 
margin keeled throughout. Wings fully developed (chamjrioni) or not showing 
(perditus ). Abdomen broadening to just beyond median point, with lateral 
outline convex and dorsal surface subdeplanate, feebly convex; third to sixth 
segments with dorso-lateral angles acute-angulate produced, with oblique 
keels, which ascend caudad, so that the apices of these angles are above the 
adjacent dorsal al)dominal surface, these projections more decided on fourth 
and fifth segments; stink glands of third segment weak, of fourth segment well 
developed; seventh and eighth segments feebly produced dorso-laterad; ninth 
with only brief caudal margin showing. Ultimate dorsal abdominal segment 
with weak convexities at leases of forceps and brief ridges laterad, which diverge 
caudad (these stronger in championi)\ latero-ventral margin of this segment 
terminating in a minute, slender, conical projection at the lateral projection of 
the penultimate ventral abdominal segment. (Though very similar in general 
character, the forceps of perditus do not have a proximo-internal tooth, such a 
tooth is strongly developed in championi.) Penultimate ventral abdominal 
segment produced latero-caudad in slightly divergent projections. Caudal 
metatarsus longer than third tarsal joint. 
OPISTHOCOSMIINAE 
Dinex americanus (Bormans) 
1893. Opisthocosmia americana Bormans, Biol. Cent.-Amer., Orth., i, p. 8, 
pi. 1, figs. 22 and 23. [Teapa, Tabasco, Mexico; Upper Amazon [South 
America]. ] 
Alhajiielo, Panama, IV, 17, 1911, (Biisck), 1 9. 
Bohio, Canal Zone, Pan., II, 7, 1911, (Schwarz), 1 cf. 
Frijoles, C. Z., Pan., (A. H. Jennings; from flowers of “Lingua 
cle Vaca”), 1 cT • 
Paraiso, C. Z., Pan., I, 26, 1911, (Schwarz), 1 9 . 
This species is discussed under 8. anomalia. In specimens of 
recessive coloration, the proximal antennal joints are somewhat 
darkened. In the male from Bohio, the forceps are not as highly 
specialized as is normal; the dextral shaft is simple, without the 
characteristic heavy tooth. 
Different degrees of development of the organs of flight are clearlj' of no 
generic value in the present subfamily. 
TR.\NS. -\M. EXT. SOC., XLIII. 
