ART. 17. LAKVAE OF HOLARCTIC TIGER-BEETLES— HAMILTON. 47 



Larvae were collected at Salida, Colorado, in a sand dune near 

 water along the Arkansas River and from Benkelman, Nebraska, 

 on the south fork of the Republican River in the crest of sand dunes. 

 At Salida, Colorado, the sand was coarse and fine mixed and had 

 probably been deposited by high water. The holes were vertical 

 and about 22 inches deep. The burrows have a pit similar to those 

 of Cicindela fo^-mosa generosa found around Chicago, Illinois, and 

 Pines, Indiana. 



CICINDELA FORMOSA GENEROSA Dejean. 



Figs. 49, 50, 51, 8S, 89, 90, and 142. 



Shelfoud, reared, larvae in tlie collection of the University of Illinois, 



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

 1908, Shelford, ,Tourn. Linn. Soc. Lond., Zool., vol. 30, p. 172. 

 Color.— RQ2idi and pronotum chestnut brown with a color pattern 

 of lighter areas; setae on dorsal aspect of head and pronotum trans- 

 parent to white, the other setae brown. 



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

 eter of ocellus 2 distinctly less than the distance between ocelli 1 

 and 2; fionto-clypeo-labral area as long as broad; U-shaped ridge 

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

 mal segment slightly shorter than the second, the third one-half and 

 the distal one-third' the length of the second, the proximal segment 

 with six or seven setae and the second, with nine or ten; maxilla 

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

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

 fine setae aiTanged in a transverse row at its ventro-distal end, 

 proximal segment of labial palpus with two spinelike projections 

 on the ventro-distal margin and with three setae on the mesal and 

 two on the lateral side of these spines, the proximal segment with 

 five setae and the distal segment with one. 



7^7(0,^^3. .—Pronotum with the cephalo-lateral angles not extending 

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

 carinate, primary setae not large and prominent, seta 6 wanting, 

 secondary setae wanting (fig. 51). 



Abdomen.— Chitinized areas distinct, secondary setae almost as 

 long as the primary setae, slender and numerous (fig. 90) ; ninth 

 abdominal sternum with the caudal margin bearing two groups of 

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

 four setae, the spinelike projection one-third the length of the hook 



(fig. 142). 



Measurements.— I^ength of larvae, 22 to 24 mm.; width at the 

 third abdominal segment, 3 to 3.3 mm. ; diameter of ocellus 2, 0.30 

 to 0.32 mm. ; distance between ocelli 1 and 2, 0.37 to 0.40 mm. ; length 



