June-Sept., 1919.] ALEXANDER: NEOTROPICAL CRANE-FLIES. 149 



In the lack of cell M t of the wings, this species is evidently allied 

 to P. conjuncta Alex. (Psyche, vol. 21, pp. 44, 45; pi. 4, fig. 2; 1914) 

 of Guatemala; the latter is a larger species (wing over 9 mm.); 

 with the mesonotum yellowish-brown, the praescutum with four dark 

 brown markings, the pleura yellowish; femora yellowish-brown; 

 wings subhyaline with the tip darkened. The venation of the two 

 species is quite distinct, in conjuncta the basal deflection of /? 4+5 being 

 long, ce.ll 1st M 2 more elongate, with the basal deflection of Cu^ in- 

 serted at about midlength and the second anal vein decidedly longer. 



Genus Tanypremna Osten Sacken. 



Tanypremna fuscitarsis new species. 



General coloration chestnut-brown, the praescutum with darker brown 

 humeral angles ; legs dark brown with only a narrow white band before the 

 tips of the tibiae; wings subhyaline; abdomen greenish-brown, the tergites 

 banded with paler. 



Male. — Length, 26.5 mm.; wing, 15.6 mm. 



Fore leg, femur, 12. 1 mm.; tibia, 12.7 mm.; hind leg, femur, 13.2 mm.; 

 tibia, 14.3 mm. 



Frontal prolongation of the head short, pale greenish-white, the rostrum 

 and palpi brown or the latter a little more greenish. Antennae short, the three 

 basal segments pale yellowish ; flagellar segments dark brown. Head pale 

 golden-yellow with a narrow dark brown median line. 



Mesonotal praescutum chestnut with a dark brown median stripe ; the 

 usual lateral stripes are separated from the median stripe by deep impressed 

 furrows ; a triangular yellowish mark on the lateral margins of the praescutum, 

 continued anteriorly along the lateral margin of the median stripe and so 

 cutting off a broad triangular dark brown mark at the humeral angles ; scu- 

 tellum brown, the median area depressed; scutellum pale; postnotum dark 

 brown, the margins pale. Pleura pale greenish-yellow, the dorso-pleural mem- 

 branes dusky. Halteres pale basally, the knobs dark brown. Legs with the 

 coxae pale, the outer faces a little infumed ; trochanters greenish, a little infus- 

 cated beneath ; femora dark brown, more greenish basally ; tibiae dark brownish- 

 black, a narrow (1.5 mm ) white band before the broader (about 2.5 mm.) 

 dark tip ; tarsi dark brown. Wings in the teneral type, pale, the stigma 

 darker. Venation (Plate I, Fig. 16) : Rs short, straight, oblique, a little 

 shorter than 7? 2+3 ; R 2 running close to R u the cell 2d R x being very long and 

 narrow ; deflection of i? 4+!i short or punctiform ; cell 1st M 2 elongate. 



Abdominal tergites greenish-brown with an indistinct pale transverse band 

 dt about midlength of the segments ; basal tergites with a pale area at the 

 anterior lateral margin ; lateral line dark brown ; sternites yellow, the apices 

 of the segments brown, the basal segments strongly greenish. 



Habitat : Colombia. 



