emery: SIMULIUM VITTATUM in KANSAS. 351 



7. No setae on the last joint of the maxillary palpus, middle tooth of 



the labium longer than the two lateral ones, four pairs of sets 

 on its ventral surface. The pair of apical setae of the mandible 

 not differentiated from the hairs which overhang the apex. 



vieribionale 

 Mandible with a pair of apical bristles, palpus of the maxilla with 

 setae 8 



8. Middle tooth of the labium enlarged, ventral surface of labium with 



five pairs of setae (pi. 37, fig. 6) venustum 



Middle tooth not enlarged (varieties of vemistiiin) 9 



9. Labium with four pairs of ventral setae (pi. 37, fig. 14) . . . .var. a 

 With seven pairs of setse (fig. 5) var. piscicklhim 



PVPJE. 



(Arranged according to llic number of fil.amenls in each respiratory tuft.) 



1. With six filaments: 



a. Legs in their cases appear bicolored * venustum 



b. Legs unicolored meridionale 



2. With eight filaments: 



a. Pupa 4.5 mm. long; Arizona species. Pupa described in Airi. 



Ent. Soc. Trans., p. 45; 1893. 

 6. Less than 4 mm. long; eastern species. 



venustum, var. pisciciiiuim 



3. With nine filaments. Pupal case like that on plate 35, figure 5. 



pictipes 



4. With ten filaments var a of venustum 



5. With twelve filaments. Pupal case (pi. 35, fig. 5). From Santa 



Cruz mountains, California (p. 387). 



6. With sixteen filaments vittatnm 



7. With twenty-four to forty-eight filaments (pi. 33, fig. 10). 



pecuanun 



8. With sixty or more filaments hirtipes 



Imagines. 



1. Ground color of the thorax and abdomen deep yellow 2 



Gray or black ; its hairs may be pale 3 



2. "Femora with black tip, length of fly 2 mm." Mexico. . .ochraccum 

 "Femora with black tips. Length 3 to 4.5 mm. Rocky Mountains." 



fulvKin 



3. Hind tarsi with its basal joint partly yellow; legs bicolored :) 



Hind tarsi unicolored f 4 



4. Halteres dusky; thorax not striped 5 



Halteres white or yellow; the female with striped thorax and bifid 



tarsal claws 6 



* In order to see this it will be necessary to c-xamine nearly mature specimens, and 

 perhaps to draw them from their pupal skins. 



t The main of the pu-li/irs sometimes has legs nearly unicolored; it is, however, included 

 iu the preeedinf? section. 



