REHN AND HEBARD 41 



nodes or by aciculate structures ranging to what would be 

 considered long spines. In another species {calcaratus) the spines 

 are completely absent and, although we have but two speci- 

 mens of the species and cannot say how constant this feature is, 

 this shows the condition which may occur in a genus supposed 

 to be characterized by having strongly developed prosternal 

 spines. The mesosternal lobes show an appreciable amount of 

 individual variation in form in most of the species of the genus, 

 the angle generally being submammillate. The abdomen almost 

 always bears traces of a median and accompanying lateral 

 earinae, which are sometimes continuous and again broken but 

 indicated. There is, however, some variation in certain species 

 in the intensity of the abdominal earinae. In several species 

 the earinae bound color areas in individuals of certain color 

 patterns. The caudal femora show as great a percentage of 

 fixity in their general character and proportionate length as 

 any of the more evident features of these insects. The only 

 variation in femoral length seen, which is not correlated with 

 general bulk, is geographic and can be demonstrated as such 

 from the material in hand. The spination of the ventro-internal 

 margin of the caudal femora is very variable in the number of 

 spines present and we have found it of no diagnostic value. 

 The spination of the cephalic and median limbs and of the caudal 

 tibiae do not furnish us with any features of classificatory value. 

 The spurs of the distal extremity of the caudal tibiae, and par- 

 ticularly of the internal face, do, however, give important 

 features not previously utilized. These have been indicated 

 under Classification (page 35). 



Coloration Notes. — All of the forms of this genus are charac- 

 terized in general coloration by somber or warm browns, red 

 browns, or ochers, of a more or less protective character. The 

 principal feature of the coloration, which modifies the appearance 

 of individuals of the genus, is the presence of blackish fuscous 

 as a wash on the dorsal section of the lateral lobes of the pro- 

 notum, and occasionally on a portion of the pleura and sides of 

 the abdomen. This feature is variable in extent and depth 

 and is frequently accompanied, when decided, with a fine stip- 

 pling of the same fuscous over the paler area, but tiiis fuscous 



TRANS. AM. ENT. SOC, XLII. 



