236 BRITISH GUIANA TIPULIDAE 



Pronotum black 7 



7. Small species (cf , length, 2.5-3 mm.); legs with the basal two-thirds 



yellowish-tawny [head black; halteres brown, knob yellow; 

 apical band including the distal end of cell 1st Mt}. (Brazil) 



polita Osten Sacken^ 



Larger species ( 9 , length, 5 mm.) ; legs dark brown [head black; wings 



with the apical band not including the distal end of cell 1st Mt 



which is seamed with brown; basal band narrow, linear.]. (Costa 



Rica, Panama.) rostrata Enderlein* 



8. The apical band on the wings not including the distal end of cell 



lstM2 9 



The outer band on the wings including the distal end of cell 1st Mi 10 



9. Basal band on the wings narrow, linear; mesothorax mostly yellow; 



femora without a medial band [thorax with a large black spot on 



the middle of the praescutum; pleura clear yellow; legs' dark 



, brownish black except the base of the femur which is paler]. 



(Brazil) pulchella Alexander' 



Basal band on the wings broad, diffuse; mesothorax mostly dark; 

 femora with a brown medial band [colors on the wing-disc much 

 paler, less well defined ; head yellowish usually with a dark brown 

 mark on vertex] . (Guiana) melanocephala Fabricius^" 



10. Wing markings not so extensive, the band along the cord narrow, not 



extending caudad of the basal deflection of Cui and in no way 

 connected with the apical band [head dark brown; pronotum 

 very light yellow; mesonotum with a chestnut dorsal stripe; 

 femora yellow with the tip black-]. (Central America) 



sackeni Alexander" 



Wing markings extensive, the band along the cord broader, attaining 



the hinder margin of the wing and connected along the costal 



and caudal margins with the broad apical band and thus enclosing 



a large oval spot of hyaline 11 



11. Head black; pleura with a large blotch; basal cells of the wing suffused 



with dark color; size larger (9, 6.1 mm) [pronotum light yellow; 

 hind legs blackish; halteres dark throughout]. (Peru) 



jucunda Alexander^* 

 Head reddish brown; pleura unspotted; basal cells of the wings almost 

 devoid of dark color; [pronotum yellow; halteres dark through- 

 out]. (Bolivia) laeta Alexander" 



^ 1887. polita Osten Sacken, Berl. Ent. Zeit., xxxi, pt. 2, 189. 



« 1912. rostrata Enderlein, Zool. Jahrb., xxxii, pt. 1, 68, 69, fig. Q\. 



" 1913. -pulchella Alexander, Psyche, xx, 44, pi. 2, figs, h, I. 



"1794. melanocephala Fabricius, Entomol. Syst., iv, 241 {Tipnla). 



" 1913. sackeni Alexander, Psyche, xx, 42, 43, pi. 2, fig. a. 



'2 1913. jucunda Alexander, Ent. News, xxiv, 441, 442, pi. 16, fig. 4 



" 1913. hu'.ia Alexander; ibid., 442, 443, pi. 16, fig. .5. 



