316 THE CANADIAN ENTOMOLOGIST 



Chironomus gualtemaltecus, n. sp. 



9 — Length about 6 mm., wing 4 mm., anterior tarsus 5.75 

 mm. Antennae 7-jointed, pale ochraceous, last joint black; length 

 of joints in microns: (2) 64, (3) 144, (4) 136, (5) 128, (6) 96, (7) 224; 

 first joint very broad, cushion-like; second short, cylindrical, 

 slightly swollen apically; 3 to 6 flask-like, bulbous at base, narrow 

 and neck-like apically; 7 narrow and cylindrical, tapering apically; 

 joints 2 to 6 with very long hairs (one hair on 4 fully 333 microns 

 long, one on 6 288 microns) ; 7 with much shorter (about 65-80 

 microns) curved hairs. Palpi dusky. Thorax finely hairy, pale 

 ochraceous; mesonotum dull (the bands faintly shining), with three 

 reddish or reddish-fuscous longitudinal bands, the middle one 

 divided into two by a fine median line and ending abruptly pos- 

 teriorly a little beyond middle of mesonotum; lateral bands very 

 broad, evanescent anteriorly; scutellum pale yel owish; metathorax 

 rufofuscous; halteres with dark knob. Abdominal segments with 

 basal half or rather more (especially on segments of apical half) 

 black, and apical border pale ochraceous. Legs very pale och- 

 raceous, marked with dusky; femora with a suffused dusky sub- 

 apical ring; anterior tibiae with more than the basal half, as well as 

 the extreme apex, dusky; middle and hind tibiae dusky at extreme 

 apex, and faintly so at base; tarsal joints dark at apex; anterior 

 tibiae 1408-1440 microns long, anterior basitarsi 1370-2495. Wings 

 hyaline, iridescent, with very pale veins, a dark spot at cross-vein 

 as in allied species'; fork of vein 5 a little beyond level of fork of 

 3-4; end of vein 3 very near wing tip, about as in C. fallax, but 

 wing is narrower in proportion to its length than in that species; 

 three very distinct anals. 



Hab. — Guatemala City, Guatemala (W. P. Cockerell). 



In Johannsen's key (Bull. 86, N. Y. State Museum) it runs to 

 C viridkollis, which differs in many details; in the auxiliary key 

 it falls near C. albistria Walker, from Hudson's Bay. In Malloch's 

 key (Bull. 111. Lab. N. Hist., X, p. 416 et seq.) it falls near C. 

 seriis or C. decorus. It is actually very close to C. decorus, differing 

 especially by the dusky anterior tibiae and lack of greenish colour. 

 I am indebted to Professor Johannsen for specimens of C. decorus 

 (as well as a number of other species), and find that the species is 

 undoubtedlv distinct;. 



