NEOTROPICAL MALLOPHAGA — CARRIKER 423 



carina; mesosome very different, resembling somewhat that oipictura- 

 tus but with a much smaller penis. 



The species is represented by a single specimen, the male holotype. 



Formicaphagus niinutus, new species 



Figures 3,c; 4,/; 6,</ 



Types: Male and female adults from Herpsilochmus rufomarginatus 

 f rater Sclater and Salvin, collected by the author at Upata, Venezuela, 

 Feb. 22, 1910 (author's collection). 



Diagnosis: One of the group of small species, with body larger than 

 angustifrons and clypeatus, but head smaller than in the latter (male, 

 0.402X0.38 against 0.434X0.412; female, 0.423X0.434 against 

 0.434X0.434); the head is longer than wide in the male and wider 

 than long in the female. 



Sides of head, between coni and tips of frons, forming a straight 

 line; anterior plate small and similar to that of thoracicus except that 

 frons is wider and the incrassations smaller; premarginal carinae wide 

 and short, with nodi large and circidar; no postmarginal carinae; the 

 carinae uniting premarginal nodi and posterior mandibular condyles 

 very wide. 



Pro thorax short, with sides flatly convex and almost parallel; 

 pterothorax small, being especially narrow (0.16X0.31). 



Abdomen of normal shape and color, the pleurites well developed, 

 about equal in the sexes and pitchy black dorsally, with ventral 

 portion wider and paler; all setae rather short and slender, except 

 those around posterior margin of genital plate which are slightly 

 longer than usual; the ventral patches of setae on each side of segment 

 VIII contain a longitudinal row of seven setae, with two smaller 

 ones near margin which point backward. 



The male genitalia are quite different from the other known species, 

 with basal plate much longer, with wide, heavily chitinized marginal 

 carinae on swollen basal portion; the parameres are oval in shape, very 

 similar to those of peruvianus but without marginal carinae; the 

 mesosome is very rudimentary, merely an undulating transverse bar 

 which supports an unusually large penis. 



The species is represented by the female holotype, male allotype, 

 and one female paratype. 



Formicaptiagus thoracicus, new species 



Figure S,d 



Type: Female adult from Gymnopithys leucaspis bicolor (Lawrence), 

 collected by the author at Quibdo, El Choco, Colombia, Alar. 13, 

 1918 (author's collection). 



