NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 647 



opening broadly dorsad, basal extremity weakly and irregularly emar- 

 ginate ventrad, approximate apical seventh moderately expanded 

 dorsoventrad and irregularly opening dextrad; apex produced into 

 prominent, heavily sclerotized, acute, sinuate, recurved, sinistral, 

 spinelike process approximately one-fourth as long as aedeagus. 



Vesica small, membranous; densely clothed with extremely small, 

 slender, finely acute, needlelike processes or spicules. 



Type. — Type d^ (type no. 15419) in the U.S. National Museum. 



Type locality. — Orizaba, Mexico. 



Distribution, — Central America and Mexico northward into 

 southwestern United States. Texas. 



Source of material. — U.S. National Museum (2 cfcf). 



Specimens examined. — 2 (both cf cf), from 2 localities: 



Costa Rica: Sixola River, cf (no date, William Schaus collection). This 

 specimen is from the type series representing /ert^idus. It is labeled "Acrolophus 

 fervidus Busck, cotype, U.S.N.M. type no. 15419." Texas: San Antonio, Bexar 

 Co., cf (no date, William Barnes collection). This specimen is the holotype of 

 antonellus (Barnes & McDunnough), treated below as a synonym of fervidus. 



Remarks. — This species is recorded here from the United States for 

 the first time. It is closely related to persimplex and the complex 

 species, sinclairi, forming with them a rather distinct species group. 

 Briefly, this group may be characterized as having shortened labial 

 palpi, antennae in which each segment is clothed only dorsad or dor- 

 solaterad with scales, obscurely bifid uncus, fused gnathos, and a type 

 of harpe in which the cucullus is very broadly expanded. The mem- 

 bers of the persimplex-fervidus-smclairi species group may be distin- 

 guished from one another on the basis of antennal and genital 

 characters. 



A.jermdus may be distinguished from its close relatives by its rather 

 unusual color pattern, the shape of its cucullus, and its characteristic 

 aedeagus. The apex of the latter organ is produced into a prominent, 

 recurved process in this species. The antennal structure oi fervidus 

 represents a transition between the laminate and unipectinate types. 

 Within the species group in question, fervidus is most closely related 

 to persimplex on the basis of antennal and genital structure. How- 

 ever, the harpe and aedeagus oi fervidus are quite distinct from those 

 of persimplex as well as from those of all the other species of Acrolophus 

 known to occur in America north of Mexico. 



I have examined the type cf specunen at the U.S. National Museum. 

 It is labeled "Acrolophus fervidus Busck, type no. 15419, Orizaba, 

 Mexico, May 1908." Dr. Clarke removed the genitalia of the type 

 for me and the identity of this species was further confirmed. It 

 is apparently quite common in Central America. 



676-573 — 64 11 



