ART. 17. LARVAE OF HOLARCTIC TIGER-BEETLES HAMILTON. 43 



Abdomen. — Cliitinized areas distinct, secondary setae almost as 

 long as the primary setae, fine and not numerous (fig. 107) ; ninth 

 abdominal sternum with the caudal margin bearing two groups of 

 three setae each; median hooks with three setae; inner hooks with 

 two setae, the spine-like projection one-third the length of the hook 

 (fig. 137). 



Measuremeiits. — Length of larvae, 17 to 19 mm.; width at the 

 third abdominal segment, 2 to 2.3 mm.; diameter of ocellus 2, 0.26 

 to 0.27 mm.; distance between ocelli 1 and 2, 0.23 to 0.25 mm.; 

 length of fronto-clypeo-labral area, 1.25 to 1.35 mm.; width, 1.25 to 

 1.35 mm. ; length of pronotum, 1.7 to 1.8 mm. ; width, 2.7 to 2.9 mm. 



The larvae were collected at Houston, Texas, in heavy, clayey soil. 

 The holes were about 4 inches long and curved almost to a horizontal 

 position at the bottom, 



CICINDELA UNIPUNCTATA Fabricius. 



Figs. 71, 108, and 138. 

 Shelford, not reared, larvae in tlie collection of the University of Illinois. 



Color. — ^Head and pronotum a purplish bronze with a green reflec- 

 tion; setae on dorsal aspect of head and pronotum transparent or 

 glassy, the other setae brown. 



Head. — Setae on dorsal aspect long, stout, and prominent; diam- 

 eter of ocellus 2 slightly less than the distance between ocelli 1 and 

 2; fronto-clypeo-labral area as long as broad; U-shaped ridge on 

 caudal part of frons bearing two setae; antenna with the proximal 

 segment as long as the second, the third two-thirds, and the distal 

 one-half the length of the second, the proximal segment with seven 

 or eight setae and the second with seven or eight; maxilla with the 

 proximal segment of the galea bearing three setae on its mesal mar- 

 gin, maxillary palpus three-segmented; ligula with four fine setae 

 arranged in a transverse row at its ventro-distal end ; proximal seg- 

 ment of labial palpus with three spine-like projections on the ventro- 

 distal margin and with two setae on each side of these spines, proxi- 

 mal segment with four setae and the distal segment with one. 



Thorax. — Pronotum with the cephalo-lateral angles extending dis- 

 tinctly cephalad of the mesal portion, lateral margin carinate, pri- 

 mary setae not large or conspicuous, secondary setae wanting or very 

 minute (fig. 71). 



Abdomen. — Chitinized areas distinct, secondary setae not numer- 

 ous, and from short to more than one-half the length of the primary 

 setae (fig. 108) ; ninth abdominal sternum with the caudal margin 

 bearing two groups of four setae each; median hooks with three 

 setae; inner hooks with five or six setae, the spine-like projection 

 about one-third the length of the hook (fig. 138). 



