2l8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I25 



Types. — Holotype (J*) and allotype ($), mounted, in part, on 

 slides, the rest on pins, and paratypes (40 J^c^ and $$), in the collec- 

 tion of the Institute de Salubridad y Enfermedades Tropicales, 

 Mexico City; collected in the Aldea El Naranjo, Soconusco, Chiapas, 

 Mexico, 1,400 meters above sea level, December 1944. 



SIMULIUM (SIMULIUM) KOMPI Dalmat 



Simulium (Simulium) kompi Dalmat, Ann. Ent. Soc. Amer., vol. 44, No. i, pp. 

 38-42, figs. 8-15, 1951 (original description, c?, and $ genitalia, pupa). 



Only the 2 pupae used to prepare the original description of this 

 species have been collected to date. The following descriptions of the 

 male and female genitalia were made from the formed imagines that 

 were dissected from the pupal cases. 



Male (pi. 25, figs. 79-81). 



Genitalia: Sidepiece (pi. 25, fig. 79) 0.14 mm. long, 0.17 mm. 

 wide, with no outstanding projections or prominences ; dorsal opening 

 occupying more than half the dorsal surface of sidepiece. Clasper 

 (pi. 25, fig. 79) 0.18 mm. long, about three and one-half times as long 

 as it is wide, the middle being slightly constricted and the base with a 

 slight swelling ; distal end broadly rounded, with a single blunt, bifid 

 terminal spine ; on the ventral face, about one-fourth the distance from 

 the apex, there is one very strong, heavily sclerotized spine. Body of 

 adminiculum (pi. 25, fig. 80) longer than wide, with a distinctive 

 pentagonal shape ; apex in form of blunt angle, both arms forming the 

 angle completely clothed with numerous rather long, wavy hairs; 

 similar hairs present in central patch on body of adminiculum ; basal 

 processes well sclerotized, terminating in broad, spatulate expansions ; 

 on outer margin of each process is a hyaline, winglike expansion. 

 Arms of adminiculum (pi. 25, fig. 81) with approximately 14 well- 

 separated teeth along the distal three-fourths, some of the teeth ex- 

 tremely long ; lateral plate irregularly triangular in shape. 



Female (pi. 32, figs. 199-201). 



Genitalia: Cercus (pi. 32, fig. 199) higher than long (wide), 

 somewhat narrower ventrally, with posterior angles well rounded. 

 Anal lobe (pi. 32, fig. 199) with posterior margin almost straight and 

 anterior margin rounded ; strongly tapered dorsally and with a small 

 posteriorly directed protuberance from the ventral margin. Genital 

 rod (pi. 32, fig. 201 ) with rather extensive ovate basal dilatation ; arms 

 of genital fork branch broadly, each arm bearing 2 irregular, triangu- 

 lar-shaped expansions near its middle, one on the inner margin, the 

 other on the outer margin ; apex of arm heavily sclerotized and 

 pointed ; wavelike expansion extending on outer margin of each arm 



