THE nillATURE STATE OF THE ODOXATA. H 



Abdomen large, long, more or less tapering, more than half length of 

 body, rounded above, fiat beneath. Segments of equal length, tenth always, 

 and occasional!}' the ninth shorter, no dorsal spines except in the La Guayra 

 species. Lateral spines always on segments seven to nine, generally on .six to 

 nine, and exceptionally on five to nine and four to nine. AiTjjendages as long or 

 longer than the tw^o last segments ; inferiors long, sharp, triangular ; middle ap- 

 pendage generally a little shorter, notched at tip, — sometimes of equal length, 

 with undivided or split tip. Lateral superiors cylindrical, generally shorter, 

 exceptionally as long and sharp as inferiors. Male has on the basal portion of 

 middle appendage a triangular projection ; .short, sometimes cut at tip. Gen- 

 itals not very distinctly marked ; on ventral segments two, three, and nine. 

 Female valve is visible on sejrment nine, sometimes reachino; end of segment. 



The whole body is either smooth, or has a granulated appearance, which is 

 due to microscopical spines and small holes, sometimes with flattened yellow 

 or pale colored hairs of differing size, never however such as to give a hairj' 

 look. The La Guayi'a species is distinguished by its stronglj' sculptured ap- 

 pearance. Generally, the occiput has on each side the median line a polished 

 depression, and on the hind angles a series of parallel polished bands, sepa- 

 rated by narrow rough lines. The abdomen has on each segment, less* 

 distinct on the first and apical segments, eight polished impressions ; two 

 near the median line and two on the edge of abdomen on each side. Color 

 pale gray, sometimes darker or brownish black. 



There are frequently black spots on occiput, and the sides near the eyes 

 are sometimes bordered with black. Legs have frequently darker rings on 

 femora and tibite, sometimes on. tarsi. Abdomen has sometimes a broad 

 dorsal band, pale in color, divided in centre by a band which is darker, except 

 along the median line, which is again pale. Appendages have the tip some- 

 times darker than the basal part. 



G-YNACANTHA. 



Eambur, Hist, des Xeuropteres, p. 209. 



Body elongated, very slender, flattened. Length of head greater than 

 breadth. Occiput deeply notched at base ; sides straight, forming right angle 

 with base. Ej-es narrow in proportion, two thirds length of head, not prom- 

 inent, broadest in middle, not much produced at inner angles. Antennas 

 seven-jointed ; sixth joint longest. Mask extending between hind legs, very 



