ART. 17. LARVAE OF HOLARCTIC TIGER-BEETLES HAMILTON. 23 



nate, primary setae large and prominent, seta 7 wanting, secondary 

 setae not more than ten in number and small (fig. 59). 



Ahdomen. — Cbitinized areas distinct, secondary setae short, few 

 and not conspicuous (fig. 95) ; ninth abdominal sternum with the 

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

 with four setae; inner hooks with two setae, the spine-like projection 

 one- third the length of the hook (fig. 125). 



Measurements. — Length of larvae 17 to 19 mm., width at the third 

 abdominal segment, 2.4 to 2.6 mm.; diameter of ocellus 2, 0.29 to 

 0.31 mm. ; distance between ocelli 1 and 2, 0.26 to 0.28 mm. ; length 

 of fronto-clypeo-labral area, 1.10 to 1.15 mm., width, 1.20 to 1,25 

 mm, ; length of pronotum, 1.6 to 1.7 mm., width. 2.5 to 2.7 mm. 



The larvae were collected at San Diego, California, on the beach 

 in the tide flats just above high tide. They were taken from sand 

 covered with mud and from pure sand. The holes were fi*om li/o 

 to 3 inches deep. 



CICINDELA SEXGUTTATA Fabricus. 



Figs. 58, 94, and 124. 



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



National Museum and author's collection. 

 1908, Shelford, Journ. Linn. Soc. Lond., Zool., vol. 30, pp. 172-173. 



CoZor.— Head and pronotum dark chestnut brown or purplish 

 brown with a slight green or blue reflection, lateral margins of pro- 

 notum lighter in some specimens; setae brown. 



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

 nent; diameter of ocellus 2 equal to the distance between ocelli 1 

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

 the caudal part of frons bearing two setae; antenna with the proxi- 

 mal and second segments subequal in length, the third two-thirds 

 and the distal one-half the length of the second, the proximal seg- 

 ment with five or six setae and the second with nine or ten ; maxilla 

 with the proximal segment of the galea bearing three setae on its 

 mesal margin, maxillary palpus three-segmented; ligula with four 

 fine setea arranged in a transverse row at its ventro-distal end, proxi- 

 mal segment of labial palpus with three spinelike projections on 

 the ventro-distal margin 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 extending 

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

 carinate, primary setae large, prominent, and slightly flattened, 

 secondary setae small and not numerous (fig. 58). 



