228 PROCEEDINGS OF THE NATIONAL MUSEUM vol. iis 



Anterior abdominal spot somewhat smaller, separated by half its own 

 width from the margin. Prosternum slightly wider, especially pos- 

 teriorly, and somewhat shorter, Hindtibia with anterior apical spm* 

 very minute, almost obsolete. Male genitalia (figs. 8, 9) large, 

 ninth segment feebly emarginate to receive the cerci. Cerci loosely 

 articulated to the ninth segment with a deep U-shaped emargination 

 between them. Lateral lobes of forked plate narrower and more 

 pointed at the apex. Forceps long, narrow, pointed, curved down- 

 ward, pale yellow with denser, shorter bristles. Aedeagus generall}' 

 similar but basal stalk blunter, apical part produced into a strong 

 proximal angle, lateral lobe less developed. Sternites 1+2 (fig. 8) 

 represented by three small plates, the central one very small, smaller 

 than the other two (sometimes rather longer and more transverse 

 than in fig. 8); sternite 3 trapeziform, posterior extension shorter and 

 wider than in S. ecuadoria; sternite 4 very transverse, not narrowed 

 laterally, sides nearly straight; sternite 5 rather irregular with a 

 considerable central membranous emargination; sternite 3 almost 

 bare, sternite 4 with some long bristles. Female (fig. 10) with sternites 

 1 -}-2 often represented by a very small transverse sclerite, sometimes 

 absent; sternite 3 usually absent, sometimes represented by a sclero- 

 tized dot; sternite 4 about two and one-half times as long as its 

 greatest width, drop shaped, narrower anteriorly than posteriorly, 

 where it is rounded, exact shape a Httle variable; sternite 5 transversely 

 crescentic, about as in S. ecuadoria. 



Ecuador: Los Kios, Pichilingue, elev. 40 m., Feb. 2, 1955, 5cf, 8 9 

 (including holotype c? and allotype 9), E. S. Ross and E. I. Schlinger, 

 CAS. Paratypes: Ecuador: Los Rios 27 mi. SW. Quevedo, elev. 

 50 m., Feb. 5, 1955, cf , Ross and Schlinger, CAS; Guayas, Naranjal, 

 December 1955, cf, R. Le\^-CastiUo, USNM. Some paratypes, 

 including one macerated cf , are in my collection. 



Sphaerocera (Parasphaerocera) tertiOf new species 



Male. Resembles S. ecuadoria, new species, very closely but differs 

 as foUows: Length about 2.6 mm. Prosternum slightly wider with 

 indications of a transverse basal piece from which the linear pro- 

 jection arises. Abdominal spots broader and the posterior one also 

 longer, about as S. trapezina. Genitalia (figs. 11, 12) large, ninth 

 segment feebly emarginate for the reception of the cerci; cerci loosely 

 attached to the ninth segment, emargination between them deep 

 and almost V-shaped; basal lobes of forked plate longer and more 

 pointed than in S. ecuadoria; forceps long, narrow, pointed, yellow, 

 curved downward more strongly than in aS". trapezina, with numerous 

 setae; aedeagus with a short basal stalk bearing finger-shaped proc- 

 esses on each side, distally with a double lateral lobe on each side and 



