454 SAMUEL H. SCUDDER ON THE 



ments of the pedigcroiis segments of the cejihalotliorax sepai-ate it widely from all knoAvn 

 Pedi|)alpi ancient or modern. In the characteristics of the body proper it approaches 

 decidedly the contemporaneons Anthi'acomaili. 



Graeophonus carbonarius. 



PI. 40, ligs. 2, 3, G. 

 Lihdlida carhonarla Scudd., Can. nat., (2), viii, 88-89, fig. 1 (187G). 



Cephalothorax (fig. 3) quadratiform posteriorly, the hinder angles scarcely rounded, 

 the hinder mai-giu gently convex, and the sides straight; anteriorly the front is regu- 

 larly and rather strongly convex, the whole cephalothorax being ueai-ly half as broad 

 again as long; on the posterior half is a sharp and deep median snlcation which increases 

 in depth posteriorly and at the posterior limit ends in a circular pit which a])pears to in- 

 volve also a part of the first al)dominal segment. Tiie whole surface is minutely and 

 delicately punctate, as is also that of the legs and palpi. What are apparently the third 

 joints of the legs are disproportionately long and tajiering. The abdomen is regularly 

 obovate, nearly twice as long as broad, the first to the fifth joints longer and equal, the 

 sixth to the ninth slightly shorter and subequal, the tenth to the twelfth scarcely more 

 than half as long as those directly preceding. The surface of the abdomen is punctate 

 as the rest of the body. 



Length of whole body, 15.5 mm.; cephalothorax, 5 mm.; abdomen, 10.5 mm.; breadth 

 of cephalothorax. 7 mm.; abdomen, 7 mm.; length of palpi, 6 mm.; Ijreadth of palpi, l.G 

 mm.; longest fragment of legs (second pair), 12 mm.; apparent length of third joint of 

 this pair of legs, 7.5 mm.; its breadth at base, 1.75 mm.; at tip, 1 mm. 



Mazon Creek, 111. Collection of Mr. R. D. Lacoe, No. 1762. 



The above description was drawn up from the specimen above mentioned before it 

 was recognized as the same species as that described by me many years ago from an ab- 

 domen alone, under the name of Lihellula carhonaria, presuming it to be a larva. A 

 direct comparison of the two, for the opportunity for which I am indebted to the kind- 

 ness of Sir Wm. Dawson, leaves little doubt on this point. IS^o marks of divergent fur- 

 roAVS or ridges can be seen on the basal segments, however (figs. 2, 6 ), and it further 

 differs from the above in that the posterior border of the eighth segment is broadly, 

 roundly, and rather deeply excised. In addition one may see large, faint, shallow de- 

 pressions on either side of each of the larger segments, at equal distances from either 

 border and the lateral ridge, which look as if in the position of stigmata. Finally there 

 is a mesial, apical, small, triangular depression on the last segment as if the cast of a 

 basal fragment of a seta, and which formerly led me to think the segment bilobed. 



The specimen is 14 mm. long and 8.25 mm. broad, though apparently it is crushed 

 out of shape a little, and should be considei'ed 7.2 mm. broad. 



The specimen comes from Cape Breton and is now in the museum of McGill College, 

 Montreal. 



Geraltn'ura Scudder. 

 Geralmura Scudd., Proc. Amcr. Acad. Arts Sc, xx, 19 (1884). 

 Cephalothorax ovate, the front rounded, narrower than the squarely truncate posterior 



