430 PROCEEDI^'GS OF THE XATIOXAL MUSEUM vol. io6 



anterior plate, a character absent in splendidus but present in grallnriae 

 and magnus. 



The premarginal carinae are wide in pittusomae and the pigmenta- 

 tion extends iiniformly to the margin of head (figs. 3,a; 5,6); the 

 manner of attachment of the prothorax to the gular plate is entirely- 

 different; carmae of the prothorax decidedly distinct; and there is 

 more contrast of color in the abdomen, the ground-color being clearer 

 and the pleurites blacker. The posterior margin of the genital plate 

 of female in splendidus is an open V, with closely set marginal setae, 

 while in piUasomae the plate is circular and the setae are longer, 

 coarser, and fewer in number. The patches of setae at sides of 

 sternite VIII in splendidus contain 9 setae, all pointing inward, while 

 in the present species there are only 6 setae pointing inward, and 1 

 backward, near margin. 



The male genitalia do not resemble those of any of the known males. 

 and a description seems unnecessary (fig. 6,6). 



Forniicaricola, new genus 



Genotype: F. analoides, new species. Host, Formicarius analis sat- 

 uratus. }vledium sized Ischnocera parasitic on the avian genus Formi- 

 carius only. Represented b}' seven species taken from seven species 

 and subspecies of the host genus. In certain characters this genus 

 resembles the preceding one, but after very careful comparison I find 

 it impossible to classify them as congeneric. Species of this genus 

 have a superficial resemblance to MuUicoJa and to some of the Fur- 

 naricola and Rallicola but they differ radicall}' from those genera in 

 structm-e of head and male genitalia, while the females lack the 

 heavy sternal spines in segment VIII so characteristic of Rallicola. 



I am fully aware that it is not good policy to erect a genus for a 

 group of MaUophaga which are parasitic on a single genus of birds, 

 but in this case there seems to be no alternative, as with the Meno- 

 ponidae of the genus Odontophorus (Phasianidae). 



The present genus differs from Forrnicaphagus as follows: Abdomen 

 longer and more slender, nearly parallel-sided ; segment VIII of female 

 with sides straight and convergmg to a deeply incised, bifid tip. 



Head much longer than wide; premarginal carinae continued beyond 

 the preantennal suture, to middle of anterior plate; anterior plate 

 more or less quadrangular, with rounded corners and with anterior 

 margin usually as wide as posterior and slighth' concave, while pos- 

 terior margin is flatly convex and never extends beyond entrance to 

 bucal cavity as in Formicaphagus. 



Xo trace of the diagonal suture across premarguial carinae in front 

 of nodus; the temporal and occipital carinae are as in Formicaphagus 

 as well as the thoracic segments and tlie plem'ites of the abdomen. 



