The Gras2oedosoinaticlse of North America. 43 



Preanal scale semi-elliptical, broader than long, broadly truncate poster- 

 iorly ; with two long slender bristles directed backward from near the posterior 

 margin, and appressed to the anal valves. 



First two pairs of legs much smaller than the others; next five pairs in male 

 crassate. Legs 10-12 longest, the legs decreasing both in length and thickness 

 caudad, so that the last pairs are very slender. 



Second legs of male with a regular row of spines bordering the last joint on 

 the ventral edge. 



Legs 3-7 not specially modified, further than being crassate, and hispid on 

 the ventral face of the last joint. 



Male genitalia of two pairs of appendages, the posterior jointed at base to 

 the anterior. The anterior pairs larger than the other and curved back- 

 ward, the posterior is more or less clavate or capitate. 



Ninth legs of male 5-jointed, the two joroximal joints subequal in size and 

 length; the other three very small; the last joint somewhat longer than either 

 of the two preceding. The shape of the joints differs somewhat in the differ- 

 ent species. 



Tenth leg of male with a conic process on the ventral face somewhat beyond 

 the middle of the proximal joint. 



Tenth and eleventh legs of male with large apertures in the basal portion of 

 the cox£e. Sometimes the apertures have raised rims which alter the outline 

 of the joint when viewed from in front or behind, and sometimes a membrane 

 or hardened secretion projects from the aperture. 



Color purplish horn-brown, usually dark, mottled and marbled with pink- 

 ish or dirty white. 



Cleidogona caesioannulata (AVood). 



SpirostrepTion ciesioannidatus Wood: Trans. Am. Philos. Soc. XIII, p. 194 



(1865). 

 Pseudotremia csesioannulatus Cope: Journ. Am. Philos. Soc. XI, p. 179. 

 Spirostrephon csesioannulatus Ryder: Proc. U. S. Nat. Museum III, p. 526 



(1881). 

 Oryptotrichus csesioannulatus (Wood) Packard: Proc. Am. Philos. Soc. XXI, 

 p. 190 (1883); McNeill, Proc. U. S. Nat. Museum X, p. 333 (1887); 

 Bull. No. 3, Brookville Soc. p. 8 (1888). 

 Campodes flavicornis Bollman (not C. L. Koch): En tomologica Americana 

 IV, p. 1 (1888) {Compodes fuscicornis and Pseudotremia vudii are also 

 here placed as synonyms by Bollman) Ann. N. Y. Acad. Set. X, p. 

 109 (1888); Proc. U. S. Nat. Museum XI, pp. 340, 344 and 405 (1888); 

 Bulletin 46 U. S. Nat. Mus. pp. 73, 83, 91, 96, 106, 120, 150, 181 and 

 183. 

 Eyes more or less triangular in form, of about 25 ocelli, six of which border 

 on the margin of the vertex, and if groui^ed in rows j)arallel to these appear to 

 be arranged 6+5+5-f 4+3+2+ (sometimes) 1--25 or 26. If the rows are 

 looked upon as transverse the numbers are, beginning posteriorly, 1+1+2+ 

 3+4+5+5+4=25, or diagonally 1+6+6+5+4+3^25. 



