PAPER III CARRIKER ON MALLOPHAGA 31 



sclerite. There are no apparent differences in the chaetotaxy of the head, 

 thorax, or abdomen, other than length of setae in some cases. 



Unfortunately two of the new forms described below are each represented 

 by a single male specimen. 



Genus Desumenopon Carriker 



Amyrsidea (part) Carriker, 1950, Rev. Acad. Colombiana Cienc, vol. 12, p. 490. 

 Desumenopon Carriker, 1954, Nov. Colombianas, vol. 1, p. 25. — Type species: Amyr- 

 sidea praegracilis Carriker. 



KEY TO THE MALES OF DESUMENOPON 



1 . Frons uniformly circular 2 



Frons not as above 3 



2. Prothorax large (0.23X0.37 mm.); head wide at temples (0.43); 



parameres much thickened basally; movable sclerite as in fig. 1. 



D. praegracilis 

 Prothorax and head much smaller (head width at temples 0.384; pro- 

 thorax, 0.17X0.34; parameres uniformly slender; sclerite as in fig. 

 19 D. speciosa 



3. Sides of genitalia deeply concave at bases of parameres, which are 



sharply recurved; occipital margin only slightly concave; prothorax 



long (0.18) D. hyperythrus complicatus 



Sides of genitalia not deeply concave 4 



4. Carinae of endomeral sac as in fig. 1 2 ; head very narrow at frons and 



temples (frons, 0.29; temples, 0.35) . . D. hyperythrus hyperythrus 



Carinae of sac as in fig. 21; head wide and of distinct shape (frons, 



0.30; temples, 0.385) D. hyperythrus ricaurtei 



5. Sides of frons almost straight, back of flatly rounded tip; occipital 



transverse carina marginal; prothorax length, 0.18. 



D. gujanensis gujanensis 



Sides of frons strongly convex; occipital carina deeply submarginal; 



prothorax, 0.165 D. gujanensis cumbrensis 



MEASUREMENTS OF MALES OF DESUMENOPON 



head at head at 



temples frons occiput prothorax pterothorax body 



praegracilis .326X .44 .335 .282 .17 X .39 .217X.445 1.88 



g. gujanensis .303X.412 .326 .282 .I95X.355 .195X.50 1.71 



g. cumbrensis .314X .415 .33 .28 .195X.37 .195X.50 1.74 



h. hyperythrus .315X.37 .27 .27 .206X.337 . 203 X .434 1.72 



h. ricaurtei .314X .40 .326 .26 .185X.36 .185X.434 1.66 



h. complicatus .303X.40 .303 .250 .18 X .35 .17 X .44 1.58 



speciosa .303X.40 .31 .26 .174X.347 .17 X .452 1.70 



