CYDNIDAE OF THE WESTERN HEMISPHERE — FROESCHNER 507 



Bolivia: Santa Cruz de la Sierra, Provincia de Sara; November. 

 Argentina: El Quemado. 

 Uruguay: Corralitos: January. 



Discussion. — Personal examination of Fabricius' type, a male, and 

 Westwood's type of serripes, a headless male, leaves no doubt about 

 their identity; also, they are identical. 



The wide geographic range and structural variability of aethiops 

 has permitted the forming of many synonyms. Even so, this is quite 

 surprising in view of the strong features which clearly define it: (1) 

 strongly emarginate apical margin of the male genital capsule; (2) 

 the subbasal angulation on the posteroventral margin of the hind 

 tibia; (3) the large ocelli set close to the eyes; and (4) the mesopleural 

 evaporatorium which extends all the way to the lateral margin of the 

 segment. Not one of the descriptions of aethiops or its synonyms 

 pointed out one of these characters, although Signoret's illustration of 

 the pleurae did show the extent of the evaporatorium. 



The type of Aethus margo Dallas is a male (BrM). According to 

 notes furnished by Dr. China it lacks the hind tibiae but does have 

 large ocelli and an apical emargination on the genital capsule, and so 

 must fall as a synonym of aethiops. Wliile the types of Signoret's 

 confusus have not been located, the various features which he used to 

 separate it from margo fall within the range of variation exliibited by 

 aethiops as here defined and so confusus cannot be maintained as a 

 distinct species. 



Pangaens {Pangaeiis) subtilius (Signoret), new combination 



Homalnporus suhtilius Signoret, 1881b, p. 331, pi. 11, fig. 49.— Lethierry and 



Severin, 1893, p. 65. 

 Homaloporus subtilisus [!] Uhler, 1886, p. 3. 



Diagnosis. — Within the subgenus, P. subtilius may be recognized by 

 having on the submargin of the jugum a complete row of setigerous 

 punctures (at least five or six of those having pegs) and virtually no 

 punctures on the mesocorium. 



Description. — In the absence of specimens for study, the original 

 description is quoted : 



Cordoba (Cong. Arg.). — Long. 5 mill., larg. 2% mill (Mus^e royal de Leyda). 



Ovale; d'un brun marron fonc6, brilliant, finement et discrfetement striol^ tt 

 ponctu6. 



T6te arrondie, bord^e de spinules et de cils, six ou sept spinules, cinq ou six 

 cila, non compris les ordinaries du vertex et de la naissance du rostre. Antennes 

 jaunes k la base, avec le deuxifeme article plus court que le troisifeme. Rostre 

 jaune, atteignant les pattes interm^diares, le premier article entierment cdche 

 (vu de c6t6) par les carfene rostrales. Prothorax avec les cotes subparalleles et 

 cili^s, glabre sur le disque, ne pr^sentant qu'une ligne de points sur I'impression 

 transverse et deux trfes fines stries faiblement ponctu^es sur le disque post^rieur, 

 le herd ant^rieur lisse, avec un sillon bien marqu6. ficusson ^troitement arrondi 



