AUT. 17. LARVAE OF HOLARCTIC TIGER-BEETLES HAMILTON. 55 



ninth abdominal sternum with the caudal margin bearing two 

 groups of three instead of four setae and by the longer spine-like 

 projection of the inner hook. 



CICINDELA HIRTICOLUS Say, 



Figs. 55, 56, 57, 91, 92, 93, and 146. 



Shelford, reared, larvae in the collection of the University of Illinois, 



the U. S. National Museum, and the author's colltiCtion. 

 1908, Shelfobd, Journ. Linn. Soe. Lond., Zool., vol. 30, p. 172. 



Color. — Head and pronotum a bright coppery color with a green 

 reflection; setae on dorsal aspect of head and pronotum white, the 

 other setae brown. 



Head. — Setae on dorsal aspect short, somewhat flattened, numer- 

 ous and prominent; diameter of ocellus 2 slightly greater than the 

 distance between ocelli 1 and 2 ; f ronto-clypeo-labral area wider than 

 long; U-shaped ridge on caudal part of frons bearing three setae; 

 antenna with the proximal segment slightly shorter than the sec- 

 ond, the third three-fourths and the distal one-half the length of 

 the second, the proximal segment with seven to nine setae and the 

 second with ten to twelve; maxilla with the proximal segment of 

 the galea bearing three setae on its mesal margin, maxillary palpus 

 three-segmented; ligula with four fine setae arranged in a trans- 

 verse row at the ventro-distal end, proximal segment of labial 

 palpus with three spine-like projections on the ventro-distal mar- 

 gin and with two setae on each side of these spines; the proximal 

 segment with four setae and the distal segment with one. 



Thorax. — Pronotum with the cephalo-lateral angles not extending 

 as far cephalad as the mesal portion, lateral margins slightly cari- 

 nate, primary setae not easily distinguished from the secondary setae, 

 secondary setae short, flattened and numerous (fig. 57). 



Abdomen. — Chitinized areas distinct, secondary setae short, few 

 and not prominent (fig. 93) ; ninth abdominal sternum with the 

 caudal margin bearing two groups of three setae each ; median hooks 

 with two setae; inner hooks with two setae, the spinelike projection 

 about one-fourth the length of the hook (fig. 146). 



Measu7'ements. — Length of larvae, 17 to 19 mm., width at the third 

 abdominal segment, 2.2 to 2.4 mm.; diameter of ocellus 2, 0.30 to 

 0.33 mm. ; distance between ocelli 1 and 2, 0.27 to 0.30 mm. ; length 

 of fronto-clypeo-labral area, 1.4 to 1.6 mm; width, 1.8 to 2 mm.; 

 length of pronotimi, 1.8 to 2.1 mm ; width, 2. 9. to 3.2. mm. 



The larvae of this species are rather distinctive and easily recog- 

 nized by the large number of white, flattened or scalelike setae on 

 the pronotum. The only other American larva studied which re- 

 sembles it in this respect is Cicindela linibata which has only about 



