712 



INSECTA. 



[arc. xvr. 



very weak generic distinction. Type 

 U. conradi, described at the same place 

 from Thedford, Canada, 

 confluens and U. emarginata, Ulrich, 1890, 



Jour. Cin. Soc. Nat. Hist., vol. 13, p. 

 20:), Kaskaskia (Jr. 

 Zacanthoides eatnni, Walcott. Not defined. 



•o^o- 



CLASS ARACHNIDA. 



In this Class (araclnie, a spider,) the body is divided into segments, some of 

 which are provided with articulated appendages, and a pair of ganglia is developed 

 in each somite. The integument is hardened with chitine. The segments of the 

 head and thorax are united, generally, into a cephalothorax. Instead of antennae 

 there are chelicera? (chelr, a claw; karat, a horn,) or mandibles (mandibulum, a jaw.) 

 There are maxillae (mamUa, jaws,) carrying long jointed maxillary palpi, (palpo, I 

 feel.) 



A.BCHITARBUS elongatum, Scudder, 1890, 



Mem. Bost. Soc. Nat. Hist., vol. I. p. 



149, Coal Meas. 

 rotundatus, read A. rotundatum. 

 Geratarbus lacoei and G. Bcabrnm, Scudder, 



1890, .Mem. Bost. Soc. Nat. Hist., vol. 4, 



]>. 44S, Coal Meas. 



Gb bophoni s carbonarius, Scudder, 1890, 

 Mem. Boat. 8oc. Nat. Hist., vol. 4, p. 

 154, Coal Meas. This is Fig. 1074, on 

 page 575, over the name Archimylacris 

 acadicum. 



KlTSTABACHNE I ell ui pes, Scudder. 1890, Mem. 

 Host. Soc. Nat Hist., vol. 4, p. 450, Coal 



Meas. 



CLASS MYRIOPODA. 



Tin* Class (mvriw, countless ; pode*, feet,) has the mouth on the under side, pro* 

 vided with mandibles and maxilla'. The head bears a pair of antenna 1 , 



Ai wtiikkcf.stes inequalis, Scudder, 1890, 



Mem. Bost. Soc. Nat. Hist., vol. 4, p. 



424, Coal Meas. 

 Amyxii.ysi'ks, instead of Amynilespes. 

 Aia iiiulus glomeratus, Scudder, 181)0, Mem. 



Bost. Soc. Nat. Hist., vol. 4, p. 436, Coal 



Meas. 

 Eiletuts sequalis, Scudder, 1890, Mem. Bost. 



Soc. Nat. Hist., vol. 4, p. 421, Coal Meas. 

 EuimoisERiA cuspidata, Scudder, 1890, Mem. 



Host. Soc. Nat. Hist., vol. 4, p. 426, Coal 



Meas. 

 granosa is represented by Fig. 1072. 

 hystricosa, Scudder, 1890, Mem. Bost. Soc. 



Nat. Hist,, vol. 4, p. 426, Coal Meas. 

 simplex, Scudder, 1890, Mem. Bost. Soc. 



Nat. Hist., vol. 4. p. 426, Coal Meas. 



spinulosa, Scudder, 1890, Mem. Bost. 



Soc. Nat. Hist., vol. 4, p. 430, Coal 



Meas. 

 tracta, Scudder, 1890, Mem. Bost. Soc. 



Nat. Hist., vol. 4, p. 4.'53. Coal Meas. 

 Ilyodes divisa and I. elongata, Scudder, 



1890, Mem. Bost. Soc. Nat. Hist., vol. 4, 



p. 422, Coal Meas. 

 Latzema primordialis, Scudder, 1890, Mem. 



Bost. Soc. Nat. Hist., vol. 4, p. 419, Coal 



Meas. 

 Palenarthrus impressus, Scudder, 1890, 



Mem. Bost. Soc. Nat. Hist., vol. 4, p. 



422, Coal Meas. 

 Xylobiits frtfstulentus, Scudder, 18°0, Mem. 



Bost. Soc. Nat. Hist., vol. 4, p. 438, Coal 



Meas. 



CLASS INSECTA. 



There are six principal veins in typical wings arising from the anterior and pos- 

 terior root, named as follows: The anterior vein at the margin of the wing is the 

 marginal vein ; this is followed by the mediastinal and scapular veins, that cut the 



