IIEMIPTEKA IIETKUOPTEUA-COIJKID.K. 411) 



Table of the genera of fossil .-llydiaee. 



Hind femora spincd beneath 1. (.'anityilui. 



Hind femora unarmed. 



Posterior lateral angles of thorax produced as a spine 2. Cydamu*. 



Posterior lateral angles of thorax not produced. 



Thorax scarcely narrower at apex than at base 3. Parodarnutut. 



Thorax distinctly tapering from base to apex. 



First joint of antenna) no longer than tho hood. 



Head distinctly longer than the thorax ; first joint of antenna 1 (at least in 1'rotenor) 



as long as tho head. 

 Body slender; thorax tapering gently, of about equal length and breadth. 



I. f'rotcnor. 



Roily robust ; thorax tapering rapidly, twice as broad as long "i. Tenor. 



Head and thorax siibci|ii.il in length ; lirst juiut of antenna) shorter tliau the head. 



Second joint of antenna) miivh longer than either of the others (5. Ktirocori*. 



Second, third, and fourth joints of antenme Hiibeijual 7 lilici>cori*. 



First joint of autenme nnn-h longer than the head 8. Orl/iriwcwiia. 



1. CACALYDUS gen. nov. (xaxos, Alyilus, 110111. gen.). 



Nearly allied to Alyilus but differing from it in the structure of the 

 antenna', which are distinctly shorter than the body ; the first joint about 

 as long as the head, the other three subequal, the terminal joint incrassated 

 gently, but no longer or scarcely longer than the second and third. The 

 head is more than half as broad as the thorax, subquadrate or subrotund, of 

 about equal length and breadth; the eyes not very strongly prominent. 

 The body is elongate, subequal, the thorax tapering forward to a greater or 

 less degree. The legs moderately stout, the hind femora strongly incras- 

 sated, and on the outer half of their inferior surface armed more or less dis- 

 tinctly with spines. These, unfortunately, are not shown in the drawings 

 of either of the species. 



Table of tliefpeciea of Cacalydmt. 



Species of largo sizo (more than eleven millimeters long); head scarcely constricted behind the ores. 



I. '. 'II/MHX. 



Species of moderate size (loss than nine millimeters long); head strongly constricted behind the, oycs. 



-'. i\ crtlirpatiu. 



1. CACALYDUS LAPSUS. 

 PI. L'5, Fijr. 1L>. 



A large species, of which unfortunately but a single specimen 4s at 

 hand. Intraocular space of the head scarcely equaling one-half the 

 width of the ln-ad, the surface rather coarsely, faintly, and transversely 

 corrugate, not constricted in tho least behind the eyes, so that then; is no 

 neck at the junction of the head and thorax. Tliorax Bllbquadrate, a little 

 broader than long, tapering but gentlv, the surface nearly smooth. Koro 



