AKT. 17. LARVAE OF HOLARCTIC TIGER-BEETLES HAMILTON. 27 



CICINDELA PURPUREA GRAMINEA Schaupp. 

 Figs. 60, 97, and 127. 



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

 1908, Shelford, Journ. Linn. Soc. Lond., Zool., vol. 30, pp. lGO-173. 



Color. — Head and pronotum dark purplish bronze with a green 

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

 other setae brown. 



Head. — Setae on dorsal aspect long, slightly flattened and promi- 

 nent; diameter of ocellus 2 distinctly 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 and second segments subequal in length, the third almost 

 two-thirds, and the distal slightly more than one-half the length 

 of the second, the proximal segment with six or seven setae and the 

 second with eight or nine; maxilla with the proximal segment of the 

 galea bearing three setae on its mesal margin, maxillary palpus 

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

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

 with three spine-like projections on its ventro-distal margin and 

 with two setae on each side of these spines, proximal segment with 

 four setae and the distal segment with one. 



Thorax. — Pronotum with the cephalo-lateral angles extending 

 almost as far cephaled as the mesal portion, lateral margins slightly 

 carinate, primary setae large, prominent and slightly flattened; sec- 

 ondary setae two in number, one cephalo-laterad of seta 5 (fig. 60). 



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

 ous, fine and medium in length (fig. 97) ; ninth abdominal sternum 

 with the caudal margin bearing two groups of four setae each; 

 median hooks with two setae ; inner hooks with two setae, the spine- 

 like projection about one-third the length of the hook (fig. 127). 



Measurements. — Length of larva, 19 to 22 mm., width at the 

 third abdominal segment, 1.8 to 2.2 mm. ; diameter of ocellus 2, 

 0.26 to 0.28 mm.; distance between ocelli 1 and 2, 0.33 to 0.35 mm.; 

 length of fronto-clypeo-labral area, 1.75 to 1.85 mm., width, 1.75 to 

 1.85 mm.; length of pronotum, 2 to 2.3 mm., width 3 to 3.4 mm. 



The adults appear from hibernation in April, mate and lay eggs 

 the latter part of the month. The eggs are laid in moderately 

 moist, black soil in openings in grassy places, such as cow paths in 

 grassy ravines and old bare places near streams. They probably 

 lay eggs only after rain on well drained soil. The larvae reach the 

 third instar the latter part of August or the first of September, 

 close their burrows and hibernate. The following spring they feed 



