NO. I BLACK FLIES OF GUATEMALA — DALMAT 247 



the outer basal angle well sclerotized, deeply pigmented, and sharply 

 pointed. Ovipositor (pi. 33, fig. 218) somewhat dome-shaped, the 

 base slightly greater than the height, more heavily sclerotized region 

 near apex. 



Pupa (pi. 38, fig. 309, and pi. 39, fig. 349).— (Respiratory appara- 

 tus alone previously described.) Granulosity on entire thorax; 5 

 short, simple, stout spinelike trichomes on either side of midline. 

 Dorsal surface of abdominal segments: No granulosity; spines on 

 segments 2-4 are anteriorly directed, those on segments 6-9 are pos- 

 teriorly directed ; segment 2 with 8 simple spines in a transverse row 

 across middle of segment, the row being divided in two by a median 

 space; anterior to the outermost spine on either end of the row are 

 2 hairs ; segments 3 and 4 with 8 simple spines in transverse rows, 

 situated somewhat before the posterior margin, each row also being 

 separated into two by a median space ; segment 6 with a band across 

 the anterior margin composed of comblike groups, each group with 

 3-7 spines, the band divided by a median space ; segment 7 with 10-16 

 simple spines in transverse row at anterior margin, the row being 

 interrupted by median space; also with combs (2-7 spines each) 

 lateral to row of spines and intermixed with it ; segment 8 with 19 

 simple spines in uninterrupted transverse row along anterior margin, 

 and with combs lateral to row; segment 9 with wide uninterrupted 

 band of combs (1-4 spines each) across anterior margin. Ventral sur- 

 face of abdominal segments : No granulosity ; all spines are anteriorly 

 directed ; segment 5 with 4 bifid spines in transverse row three-fourths 

 the distance from anterior margin, the row being divided by median 

 space ; segments 6 and 7 with similar rows of simple spines, but with 

 the 2 spines on either side of midline more separated than on segment 

 5, the distance between them being approximately equal to that of the 

 median space. Terminal spines absent. 



Respiratory apparatus (pi. 38, fig. 309) with dorsal and ventral 

 elements, and with short "tail" formed where the two elements di- 

 verge ; both elements curve so that their pointed apices approach one 

 another ; with superficial annulation and covered by microscopic spic- 

 ules. Maximum length, 1.9 mm. ; maximum width, 0.5 mm. 



Cocoon (pi. 39, fig. 349) : Length of base, 4.3 mm. ; maximum 

 width, 3.5 mm.; maximum height, 1.4 mm. Wall-pocket type, with 

 only minute rise at anterior end to form an almost imperceptible 

 collar ; cocoon with lateral winglike expansions ; rim of anterior aper- 

 ture thickened; parchmentlike texture, threads not visible. Cocoon 

 covers abdomen and half of thorax, attached along about 0.3 of its 

 base. 



