50 Prof. Charles P. Alexander on 



the humeral region and lateral margms broadly and conspicuously 

 obscure citron-yellow; remainder of the mesonotum dark clove- 

 bro¥/n, the median area of the scutum a little paler. Pleura j^ellow 

 with a conspicuous purplish brown blotch occupying the sides of 

 the mcsosternum and the mesepisternum ; mid-ventral area of 

 mesosternura pale. Halteres obscure yellow, the loiobs broken. 

 Legs with the coxae yellow; remainder of the legs dark brownish 

 black, the tips of the metatarsi and tarsal segments two to four 

 snowy white, becoming more yellomsh apically; terminal tarsal 

 segment dark brown; setae on legs profoundly bifid as in genus. 

 Wings with a strong brownish tinge; stigma not darkened; veins 

 dark browTi. Venation : 8c long, 8c\ ending beyond mid-length 

 of Rs, the extreme tip atrophied ; Rs moderately elongated, arcuated 

 at origin, in direct alignment with the deflection of i24 -f- 5 ; R2 + 3 

 arising from the end of Rs at an angle, diverging from i?4 + 5 

 toward the wing- margin; cell \st M2 closed; m short, from one- 

 third to one-fourth the outer deflection of MZ ; basal deflection of 

 Cu\ a short distance beyond the fork of M, the distance about 

 equal to m ; Cul only a little more than one-half the basal 

 deflection of C^i\.. 



Abdominal tergites brown, the caudal margins medially and the 

 basal half of the lateral margins brownish black ; posterior half of 

 lateral margins brightened, sparsely pruinose; on the subterminal 

 segments the coloration is largely black, j^roducing a subterminal 

 ring; sternites with the basal half of each segment dark brownish 

 black, the posterior margins broadly yellowish ; hypojiygium 

 yellow. Male hypopygium with the pleural appendages appearing 

 to arise near the base of the inner face of the pleurite, bent dorsad 

 and thence caudad, lying parallel, their tips divergent. ' 



Rah. Colombia. 



Holotype, ^, Boca del Condoto, January 20, 1915 {Dr. 

 H. G. F. Sjmrrell). 



Type in the collection of the British Museum (Natural 

 History). 



Polymera tibialis, sp, n. 



General coloration brown; mesonotal praescutum with four 

 narrow brown stripes; antennae of the male elongate, annulate; 

 thoracic pleura with a broad, dark brown stripe; legs brown, tips 

 of the femora and the tibiae and tarsi white ; wings yellowish brown, 

 the cord narrowly seamed with darker brown. 



Male. — Length 6-3 mm. ; wing 7-2 mm. ; antenna about 10 mm. 



Rostrum and palpi light brown. Antennae of the male very 



