208 Ridgway — New Genera of Tiira^trnidse, Pipridse, Cothigidx. 



Atalotriccus gen. nov. [Tyrannidse.) 

 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 jjilm-is Cabanis = Atalotriccus pilaris. 

 ('AraXos, tender, delicate; tp'lkkos, a small bird.) 



Placostomus gen. nov. {Tyrannidse.) 



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

 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, PlatyrhyncJtus superciliaris Lawrence. 



(IlXdf , a broad surface ; (rrbm, mouth.) 



Species: Placostomus superciliaris (Lawrence), Placoslomus corovatus 

 (Sclater). 



Cnemarchus gen. nov. {Tyrannidse.) 



Somewhat like Myioiheretes Reichenbach, but tarsus relatively nuich 

 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 smallei-, the exposed culmen not longer 

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



Type, Tenioptera erythropygia Sclater = Cnemarclius erythropygius. 



(Kvrjix6s, slope of a mountain ; apx^s, 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, Tienioptera strinticollis Sclater = Orodynastes striaticollis. 



("Opos, mountain ; Si/mo-ri^s, a sovereign or ruler.) 



