1847,] Description of JVeio and Interesting Animals. 191 



DESCRIPTION OF SEVERAL NEW AND INTERESTING 

 ANIMALS. 



BY S. S. HALDEMAN. 



Pro/eBBor of Zoology in the Franklin Institute, Philailelphia 



iEoNIA EBONINA. 



Corpus nisjrum, polifum, supra convexum, postico rotundatum, lobo inter- 

 medio abdominis angusto: clypeo intpc-ro, semicircular! postice truncato; im- 

 pressione sub-marginoli circuincincta, margine sub-incrassato; Ironte . . . . ; 

 oculis exsertis, IfEvissimis: abdomen sesmentis 10 convexis, utrinque appen- 

 diculis triangularibus in partem anteriorum seriatim inslructis. Lon?. 8g; 

 clypei 3, lat. clypei 4| lin. 



Shield or cephalothorax, wider posteriorly than the abdomen; 

 frontal sutures indistinct; submarginal impression indistinct, placed 

 half a line from the anterior margin, and continuous around the 

 shield; eyes prominent, oblong-oval, and distantly veniform, with 

 no appearance of facets. Medial lobe narrowing somewhat ra- 

 pidly towards the posterior extremity, where it is half a line wide, 

 obtusely rounded, and extends within half a line of the margin. 

 Lateral abdominal segments subcarinate within their middle, by 

 means of a longitudinal series of transversely triangular pieces 

 united to the anterior face of the segments by a depressed suture, 

 and having the apex directed forwards. Lateral extremity of the 

 abdominal segments simple and fiee, directed forwards, obtusely 

 rounded, with the anterior margin alternated, so as to admit of 

 each segment sliding beneath the one anterior to it; anterior seg- 

 ments of the pygidium with the triangular addition, segments about 

 twelve, the separating impressed striae becoming evanescent poste- 

 riorly, and extending to a shallow submarginal groove, exterior to 

 which is the simple confluent margin of the pygidium. The two 

 anterior striae exhibit a tendency to extend to the margin. Five 

 or six impressed striae, (becoming gradually shorter posteriorly,) 

 are visible upon the middle lateral portion of the larger segments, 

 indicating a bifurcation of their extremities. Posterior extremity 

 obtusely elliptical. 



The surface of the front is removed, exhibiting three transverse 

 impressions upon each side, the posterior one the largest, and di- 

 agonally backwards. 



If the three or four principal segments of the post-abdomen had 

 an independent motion, (the posterior ones being certainly con- 

 fluent,) it appears from the backward direction of the separating 

 striae upon the lateral edge of the margin, as exhibited upon the 



