208 Ridgway New Genera ofTyrannidas, Pipridas, Cotingidse. 



Atalotriccus gen. nov. (Tyrcmnidse.) 



Similar to Colopteryx Ridgway (ex Colopterus Cabanis, preoccupied), but 

 head without crest, four, instead of three, outer primaries greatly reduced 

 in size (the reduction excessive and the feathers very narrow and acumi 

 nate instead of normal in form), and bill much narrower. 

 Type, Colopterus pilaris Cabanis = Atalolriccm pilaris. 

 ('AraX6s, tender, delicate; TPIKKOS, a small bird.) 



Placostomus gen. nov. ( Tyrannidse. } 



Similar to Platyrinchus Desmarest, but latero-frontal feathers and feathers 

 of chin with conspicuous bristly tips ; tarsi and toes much more slender, 

 the basal phalanx of middle toe wholly united to inner toe , outermost 

 (tenth) primary relatively much longer (longer than fifth instead of not 

 longer than second) ; tail much smaller ( only about one-fourth, instead of 

 nearly one-half, as long as wing). 



Type, Platyrhynchus superciliaris Lawrence. 



(nxd, a broad surface ; <rr6^a, mouth.) 



Species: Placostomus superciliaris (Lawrence), Placostomus coronatus 

 (Sclater). 



Cnemarchus gen. nov. ( Tyrannidse. } * 



Somewhat like Myiotheretes Reichenbach, but tarsus relatively much 

 shorter (much less than twice as long as the relatively shorter middle toe, 

 with claw) ; claw of hallux not longer than its digit ; wing only moderately 

 lengthened, the longer primaries exceeding secondaries by much less than 

 twice the length of tarsus and much less than one-third (instead of nearly 

 one-half) the total length of wing ; outermost (tenth) primary shorter than 

 sixth (instead of equalling or exceeding ninth) and not attenuated at tip; 

 tail more than two-thirds as long as wing, even (instead of emarginate), 

 extensively rufous in color ; bristly tips of latero>frontal feathers well devel 

 oped, arched ; bill relatively much smaller, the exposed culmen not longer 

 than outer toe, without claw ; rump rufous but no rufous on remiges. 



Type, Tsenioptera erythropygia Sclater = Cnemarchus erythropygius. 

 s, slope of a mountain ; Apx^, ruler, chief.) 



Orodynastes gen. nov. (Tyrannidse.) 



Agreeing with Cnemarchus in all the characters which separate the latter 

 from Myiotheretes (except presence of rufous rump and absence of rufous on 

 remiges), but differing as follows : Bill large and strong, the exposed cul 

 men nearly as long as middle toe, with claw ; nostril midway between 

 culmen and commissure (instead of nearer to latter), broadly oval or 

 roundish (instead of wedge-shaped) ; tarsus much less than one and a half 

 times as long as middle toe, without claw ; rump not rufous, but remiges 

 extensively of that color. 



Type, Tsenioptera striaticollis Sclater = Orodynastes striaticollis. 



(*0pos, mountain ; SVMKTT^S, a sovereign or ruler.) 



