5-J4 Mr. P. Cameron on 



side nearest the troclianters. The postpetiole is broad, some- 

 what as in the Plaiyurx ; the apical segment of the abdomen 

 is not quite so bluntly pointed as in the Amhli/pygiy but 

 blunter than in the 0,rpy(){ ; it is large, fully two thirds 

 the length of the penultimate ; the ovipositor projects. 



This genus seems to be intermediate in some respects 

 between the Amhlypygi and the O.vypygi ; the ap^-x of the 

 abdomen is not quite so bluntly pointed as in the typical 

 Amhiyteles, but it is fully developed as in that genus; the 

 antennae are pretty much as in the Joppina. Its nearest ally 

 is perhaps Setanta of the genera having the mandibles with 

 only one apical tooth. Setanta may be known from it by the 

 labrum being visible, by the apex of the mandibles being 

 blunter, by the occiput not being so deeply excavated ; the 

 abdomen is longer, being fully twice the length of the thorax, 

 whereas in Setanta it is not much longer tlian it ; the apex 

 of the femora does not reach to the apex of the third segment, 

 while in Setanta the femora reach beyond the sixth. 



Of the four Nearctic and Pala^arctic genera of Heresiarchini, 

 Flngi'otrypes, Ashm., may be known from it by the large 

 head, strongly concave behind the temples, the " cheeks 

 full, buccate," and tiie metathorax bidentate ; Ileresi'arches 

 has the metathoracic areola semicircular, smooth, and shining, 

 and the gastrocoeli are linear and placed longitudinally ; 

 Rhexidermus has the scutellum margined laterally to beyond 

 the middle, and the thyridia occupy the entire breadth ; and 

 Stenodontus has the metathoracic, basal, and lateral arege con- 

 fluent. Characteristic is the stout tooth on the posterior coxaj. 



Myermo rufipes^ sp. n. 



}s'iger, albo-maculatus ; pedibus ferrugineis, coxis, trochanteribus 

 tarsisque iiigris, basi coxarum alba ; alls fere hyalinis, stigmate 

 testaceo, nervis fuscis, $ . 



Long. 13 mm. 



Antenna) black, the seventh to eighteenth joints of the 

 flagellum white, the apex of the flagellum fuscous, slightly 

 compressed, and distinctly narrowed. Head black ; the sides 

 of the clypeus, the inner orbits (broader below than above), 

 and the lower third of the outer broadly yellow. I'ace and 

 clypeus closely and somewhat strongly punctured, the clypeus 

 thickly covered with short silvery pubescence ; the lateral 

 fovese large ; the apex rufous ; palpi yellowish, darker at the 

 base. Thorax closely punctured; a line on the pronotum, 

 extending from near the base to the apex, two small some- 

 what ovate marks in the middle of the mesonotum, the 



