1985] 
Porter & O’Neil — Genus Chromocryptus 
423 
tures. Ovipositor: sheathed portion 0.39-0.41 as long as fore wing; 
straight, stout, markedly compressed; nodus very slightly suggested 
and with at most a faint trace of a notch; dorsal valve very gradually 
tapering from nodal area to near apex and then becoming slightly 
convex in profile on apex; ventral valve on tip with strong and 
nearly vertical ridges; tip 0.20 as high at nodal area as long from 
nodal area to apex. 
Male. Unknown. 
Type Material. Holotype $: ARGENTINA, Jujuy Province, 
Posta de Lozano, 27-30-XI-1967, C. Porter, E. Willink. Paratype: 
1$, same locality as holotype, 6-XII-1967, C. Porter. Holotype in 
Florida State Collection of Arthropods; paratype in Collection of 
Charles C. Porter. 
Relationships. Chromocryptus alvaradoi deviates markedly 
from other species of its genus. It shows many chromatic and struc- 
tural differences from all South and North American congeners. 
Some of these diagnostic features include the infuscate wings, 
absence of white markings on the propodeum, greater size, high but 
not asymmetric clypeus, inflated fore tibia, coarse wrinkling on 
much of speculum, comparatively long propodeal spiracle, and 
robust ovipositor with its weakly tapering (instead of sagittiform) 
tip and vertical ridges on the lower valve. 
At Posta de Lozano, this Chromocryptus occurs sympatrically 
with C. tomsici, a much smaller species that is closely related to C. 
huebrichi and C. planosae. The two form show no evidence of inter- 
gradation and confirm their specific integrity by adaptive differ- 
ences (e.g., ovipositor tip structure) which surely bespeak distinct 
host preferences. 
Field Notes. The type locality is situate on Argentine National 
Route 9 in Jujuy Province about 25 km north of San Salvador de 
Jujuy and between the villages of Yala and Leon. Posta de Lozano 
faces the entrance to the Quebrada de Humahuaca at about 1600 m 
altitude. The area supports a singularly diverse vegetation with ele- 
ments of subtropical wet forest (Erythrina, many epiphytic bromeli- 
ads), Alder Forest ( Alnus jorullensis), and, in drier exposed sites, 
with Chaco communities dominated by Serjania- festooned Acacia 
and Celtis. 
Specific Name. For Dr. Carlos Alberto Alvarado, the distin- 
guished Argentine Medical Entomologist and propietor of the Posta 
de Lozano Motel, a hospitable base for enthralling fieldwork. 
