36 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.65. 



CICINDELA TRANQUEBARICA Herbst. 



Figs. 66, 103, and 133. 



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



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

 1908, Shelford, Jourji. Linn. Soc. Ix)nd., Zool., vol. 30, p. 172. 



Color. — ^Head and pronotum dark purple or purplish bronze with 

 a strong green reflection; setae on the dorsal aspect of head and 

 pronotum Avhite, the other setae brown. 



Head. — Setae on the dorsal aspect medium in length and promi- 

 nent; diameter of ocellus 2 slightly greater than the distance between 

 ocelli 1 and 2; fronto-clypeo-labral area slightly wider than long; 

 U-shaped ridge on caudal part of frons bearing two setae; antenna 

 with the proximal and second segments subequal in length, the third 

 two-thirds and the distal one-half the length of the second, the 

 proximal segment with 7 or 8 setae and the second with 9 or 10; 

 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 transverse row at its ventro-distal end, 

 proximal segment of labial palpus with three .«pinelike projections 

 at 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 al- 

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

 carinate, primary setae large and prominent, secondary setae small 

 and not over 25 in number (fig. 66). 



Abdomen. — Chitinized areas distinct, secondary setae from one- 

 half to almost as long as the primary setae, prominent and not 

 numerous (fig. 103) ; ninth abdominal sternum with the caudal 

 margin bearing 2 groups of 4 setae each; median hooks with 3 

 setae; inner hooks with 2 setae, the spinelike projection one-third 

 the length of the hook (fig. 133). 



Measurements. — Length of larvae, 21 to 24 mm., width at the third 

 abdominal segment, 2.4 to 2.8 mm.; diameter of ocellus 2, 0.29 to 

 0.31 mm.; distance between ocelli 1 and 2, 0.26 to 0.27 mm.; length 

 of fronto-clypeo-labral area, 1.80 to 1.90 mm., width, 1.90 to 2 mm. ; 

 length of pronotum, 2.1 to 2.3 mm., width, 3.3 to 3.8 mm. 



The life history of this species is essentially the same as that of 

 Cicindela purpurea graviinea. The eggs are laid in a variety of 

 moist situations but are more often laid in sandy soil with some 

 humus and in among some vegetation. The burrows are straight 

 and from 9 to 20 inches deep. At Brandon, Manitoba, the larvae 

 were found at a uniform depth of about 18 to 20 inches and were 

 usually dug from sandy soil. Criddle (1910) says: 



