38 U.S. NATIONAL MUSEUM BULLETIN 248 posthumous 



the pleurites and their accompanying spinous processes, but no two species 

 have exactly the same male genitalia. Unfortunately, the male genitalia 

 are known from only five of the nine species examined, and the movable 

 sclerite of one is missing. 



Since the Journal in which my 1950 report appeared is not widely avail- 

 able and I received few separates for distribution, I am here giving figures 

 of the three forms described in 1 950 and including them in the key to the 

 species of the genus found on the avian genus Ortalis. 



Generally speaking, the males are much smaller than the females, with 

 the distal abdominal segment entirely different. 



In most cases the pleurites are without incrassations, or only a single 

 one poorly formed; but in certain species (most noticeable in the males) 

 there are three rounded, deeply pigmented spots. Also, in most of the 

 species the portion of the head anterior to the ocular slits (frons) is rather 

 broad and flatly rounded; but in a few species the sides of the head are 

 constricted at the anterior end of antennal fossae, making the frons narrower 

 and more sharply circular {hiiilensis and caquetae). In other species the 

 head varies noticeably in the width at temples and at the ocular slit, the 

 females range from 0.585-0.67 mm. at the temples and 0.39-0.446 at slit. 

 The nodi and carinae of the occipital area, to which is attached the 

 prothorax, also vary considerably. The ocular slit is never covered by 

 dorsal integument but in a few cases their sides seem to be fused. 



The chaetotaxy is very uniform in the various species; the only variations 

 are in the greater or lesser density of the setae along the posterior margins 

 of the tergites and the texture, length, and density of the patches of setae 

 on the third femora and the sternites. 



MEASUREMENTS OF SPECIES OF CRACIMENOPON 



body head frons prothorax 



spiculum, cf 1.69 .36X.56 .37 .22X.41 



spiculum, 9 1.84 .39 X.60 .39 .22 X .435 



garrulae, ? 2.06 .42X.66 .434 .228X.49 



microspinum, ? 2.15 .43 X.64 .44 .217X.49 



sixiolae, cf 2.00 .42 X.67 .42 .217X.434 



mirae, ? 2.02 .42 X.67 .434 .27 X. 477 



caquetae, cf 1.50 .347X.51 .37 .217X.38 



caquetae, 9 1.76 .39 X. 585 .40 . 228 X. 434 



wagleri, cT 1.71 .337X.52 .37 .195X.392 



wagleri, 9 2.06 .39X.61 .41 .23 X. 488 



huilensis, d^ 1.52 .37 X.54 .39 .217X.415 



huilensis, 9 1.97 .39X.63 .40 .26 X. 456 



ruficaudatus, 9 2.15 .45 X- 673 .446 .26X.52 



