NO. I BLACK FLIES OF GUATEMALA — ^DALMAT 97 



Others. Antenna 450 p. long, 4-segmented, not quite reaching the end 

 of the basal stalk of the cephalic fan ; segments i and 2 pale yellow, 

 segments 3 and 4 darker ; segment 3 almost equal to segment 2 in 

 length, either of these longer than segment i ; no transverse striations. 

 Submentum with 13 apical teeth arranged in three projecting groups 

 as in aguirrei, the central group with 3 teeth, each of the lateral 

 groups with 5 teeth ; ventrolateral row with 3 to 4 hairs in a straight 

 line, the most-distal bifid, the others simple; lateral margin of sub- 

 mentum with 8 toothlike serrations, the more-apical ones large. Oc- 

 cipital cleft very small, triangular in shape (pi. 42, fig. 394) . 



Thorax and Abdomen : Pseudopod (thoracic proleg) with 27-30 

 rows of hooks on its apex ; postclypeal sclerites well sclerotized, heavily 

 pigmented, long, wider at outer extremity, almost meeting at midline. 

 Posterior sucker with 80-81 rows of hooks. Anal gills 3 in number, 

 very broad at base, tapered toward apex, similar to those of aguirrei. 

 Anterior arms of X-shaped sclerite short, poorly sclerotized, well 

 masked by the pigmented patch that occupies all the space between 

 them ; posterior arms well sclerotized, extending only to lateral mar- 

 gins of segment ; no rectal scales but with a few bifid and trifid scales 

 between the anterior and posterior arms of each side. Eighth segment 

 with two well-formed conical ventral papillae, the same color as the 

 body, their bases very broad ; no sclerotized plaques. 



Types. — Pupa, in collection of J. Romeo de Leon, Guatemala City; 

 collected in a stream in the high region called "Maria Tecum," be- 

 tween Solola and Totonicapan, Guatemala, 1940. Plesiotypes, 2 (^^ 

 and 2 $$, in collection of Herbert T. Dalmat, were also collected in 

 the region of Maria Tecum. 



CNEPHIA ROBLESI (De Leon) 



Simnlmm roblesi DeLeon, Bol. Sanit. Guatemala, vol. 51, p. 97, fig. i, 1943 



(original description, pupal respiratory apparatus). 

 Cnephia roblesi (De Leon), Dalmat, Ann. Ent. Soc. Amer., vol. 44, No. i, 



p. 48, 1951 (distinguishing characters of c?, $, and pupa). 



Male (pi. 22, figs. 7-9) . — (First description of male.) 3.9 mm. long. 



Head: Holoptic. Eyes reddish brown. Antenna 610 /i, long, 11- 

 segmented, slightly tapering; segment 3<H-2, 3>44-5, 3>ii; scape 

 and pedicel brown, flagellum black. Palpi black. Clypeus black, white- 

 pruinose, irregularly covered with long black hairs. 



Thorax : Mesonotum velvety black, densely covered with long, 

 narrow, flat, appressed, golden hairs, and with some very long black 

 ones in prescutellar region. Humeral angles black, with golden ap- 

 pressed hairs. Scutellum reddish brown, with numerous narrow, ap- 



