44:6 SAMUEL H. SCUDDER ON THE 



there, crowds down the middle of the six following segments, all of which reach the mar- 

 gin and are wider there than in the middle ;^ while the last three joints are, again as there, 

 extremely broad and niiif(jrm; similar lateral farrows are also found in each. 

 This genus is American and a single species is known. 



Geraphrynus carbonarius. 



PI. 40, figs. 1,9, 10, 12. 

 Geraphrynus carhonarms Scudd., Proc. Amer. Acad. Arts Sc. xx, lG-17 (1884). 



The median ridge of the cephalothorax (fig. 10) is flat n])on the summit, with its lat- 

 eral edges a little raised, so as to cause the rest to foi-ni a flat groove; the pedigerous 

 coxal segments are very faintly ])unctnlate, so as to be scarcely perceptible ; the first pair 

 taper more rapidly toward the interior than the others from the shape of this part of the 

 body and terminate in a point, while the others pi'esent to the median ridge an edge; the 

 others taj^er about equally, their interior margins being a little more than half as long as 

 their exterior. The posterior shield has its front edges divaricating at considerably more 

 than a right angle; at the base of the anterior sloping triangle is a transverse rounded 

 ridge of considerable width, its posterior margin limited by a very broad and shallow 

 double crescentic line; following this, opposite the anterior margins of the first abdomi- 

 nal segment is a similarly waved grooved I'idge, the grooves of either side ftiding out 

 before reaching the middle line; the sinuous posterior margin of the cephalothorax fol- 

 lows hard upon this. This posterior shield of the cephalothorax is faintly punctulate 

 but more distinctly than the pedigerous segments (coxae). 



The ])ostthoracic shield is similarly punctulate, while the abdomen is profusely and 

 rather distinctly punctate (fig. 9) ; the postthoracic shield is triangular, more than half 

 as long as broad, extending laterally over about one-half of the body. The first six ab- 

 dominal segments are uniform in size at the mai-gin of the body where they occupy nearly 

 one-half of the abdomen, but mesially are crowded down less and less strongly in pass- 

 ing backward, the last showing it more in being narrowed centrally than in any other 

 way. The last three segments are equal in length though constjjntly decreasing in 

 width, and the extremity of the body is marked by a circular impression. The lateral 

 furrows of the abdomen extend fi'om the third segment backward, being sharp on the 

 narrower, deeply impressed but carrying the surface with it on the broader, segments, so 

 as to leave the outer narrower portion arched. There is besides a faint ridge down 

 the middle of either lateral half of the abdomen across all the segments, but fiiding out 

 toward the hinder extremity. 



Besides the body, however, there are several fragments of legs and palpi, the surface 

 of all of which is heavily punctate. The palpi are the most perfect, nearly or quite the 

 whole of one and half of the other being present; they ai-e attached at the extreme front 

 of the head and extend backward and outward on either side; they consist of seven joints, 

 the fii-st two small, qundrate, subequal, together reaching to the division line between 

 the first and second pair of pedigerous segments, each a little longer than broad. The 



'NotUinsr of this sorL occurs in the English Architarhus tolerably clear tliat the dorsal surface of Geraphrynus is 



s?(fc(/t!a?c Woodw., and it -would appear prol)al)le that a exposed, Woodward's specimen proljably shows a veutral 



different surface of the botly was exposed ; and as it seems asjiect. 



