332 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 112 



Key to the species of Trochiliphagus 



Body length less than 2.80 Section A 



Body length not less than 3.00 or more than 3.40 Section B 



Body length more than 3.50 Section C 



SECTION A 



Body length 2.57; head 0.63X0.64; frons 0.29 (female). Frons uniformly cir- 

 cular; transverse, frontal, and preantennary carinae narrow; propulsion sclerite 

 of sucking apparatus long and narrow; gular setae very long; sides of prothorax 

 straight; submarginal, abdominal carinae narrow, with small articulations; 

 pleurites very wide, extending considerably beyond spiracles . . . irazuensis 



SECTION B 



a. Frons uniformly rounded, with or without a slight median emargination. 

 b. Frons with a slight, median emargination. Body 3.29; head 0.78X0.65; 

 frons 0.38. Sides of prothorax straight; abdomen slender (1.08); sub- 

 marginal, abdominal carinae narrow, with prominent articulations; 



pleurites wide and strongly pigmented mexieanus 



b' . Frons without median emargination; gular setae well developed, 5 to 6. 

 c. Head wide, both at frons (0.37) and temples (0.68) ; prothorax with 

 prominent, rounded anterlateral angles, bearing a spine and 1 long 

 seta, and with concave sides; preantennary carinae with a branch 

 extending backward from median portion to antennary fossae. 



grandior 



c'. Head narrow, frons 0.32; temples 0.63; prothorax without anterior 



angles and without setae except in posterolateral portion, and with 



sides convex and undulating; preantennary carinae without branch to 



antennary fossae, but they bend inward in anterior portion to base 



of mandibles peruanus 



a'. Frons flatly convex, or transverse with two slight protuberances; ptero- 

 thorax with concave sides and definite anterior angles. 

 b. Frons flatly convex. 



c. Head small (0.69X0.60; frons 0.34); sides of prothorax undulating; 

 pleurites wide, with submarginal carinae in their median portion. 



jimenezi 



c'. Head large (0.76X0.63; frons 0.37) ; sides of prothorax straight; pleurites 



very narrow, not reaching to submarginal carinae; basal propulsion 



sclerite of sucking apparatus short and thick mellivorus 



b' . Frons transverse (a slight protuberance) in center of lateral half; frontal, 

 transverse carina wide, deeply and uniformly colored; sides of prothorax 

 undulating; pleurites very wide, extending inward beyond spiracles. 



brevicephalus 

 SECTION C 



a. Frons uniformly rounded. Size smaller (body 3.56; head 0.80X0.67; frons 

 0.37) ; sides of prothorax slightly concave; pterothorax constricted, slightly 

 forward of middle; pleurites extending inward only to inner edge of sub- 

 marginal carinae lazulus 



a'. Frons uniformly rounded. Size large, body 3.75 to 3.80; head 0.73 to 0.80 

 in width at temples. 



