868 Hans Graf von Berlepseìi : 



tail-feathers of the male wanting' the white marginal spots, 

 and the six or eight outer tail-feathers of the same sex 

 presenting only the white marginal spots on the outer webs, 

 while the spots on the inner webs to be seen in Th. ambiguus 

 are altogether wanting. The ashy-grey of the underparts 

 is lighter, and the middle of the abdomen is of a purer 

 white. The bill, too, is smaller and- shorter. 



The female is also different from the female of Th. ambiguus 

 in showing some white in the middle part of the belly, and 

 in having the sides of the body of a clearer fulvous. 



Mr. Gr. Garlepp sent me four males and two females, all 

 collected in the neighbourhood of Santa Cruz de la Sierra. 



28. Thamnophilus dinellii Beri., Bull. B.O.C., vol. XVI., 

 p. 99 (May 1906). 



TJi. 6' fronte et regione superciliari ciiierasceiitibus, pileo 

 reliquo nigro, capitis lateribus griseis albo mixtis, cervice, 

 colli lateribus dorsocjue toto cinereis, dorsi superioris plumis 

 vix nigro maculatis, basibus niveis, tectricibus caudae 

 superioribus dorso concoloribus niaculis albis terminatis, 

 corpore inferiore tectricibus que subalaribus pallide fulvis, 

 subcaudalibus laetius fulvescentibus, gula abdomineque 

 medio albicantibus, rectricibus mediis colore dorsi lavatis, 

 remigibus extus magis oliva ceo-griseo marginatis, rectricibus 

 quatuor externis apice anguste albo maculatis, duobus 

 externis in parte tertio apicali vexilli externi macula parva 

 alba ante apicem signatis, scapularibus vexillo externo albo 

 marginatis, tectricibus alarum superioribus nigrescentibus 

 apice late albo marginatis. 



? differt pileo rufescenti-olivaceo nee nigro, pectore 

 abdomineque laetius fulvescentibus, abdomiiie medio minime 

 albicante, necnon corpore superiore absque extus magis 

 rufescente-olivaceis. 



S al. 68, caud. 6(>, culm, lof, tars. 28i mm. 



? al. 69, caud. 69, culm. 15f, tars. 22 mm. 



Observatio : Th. Th. gilvicjaster Pelz, dicto (= Th.maculatus 

 Lafr. et D'Orb., nee Th. maculatus Such), affinis, differt pectore 

 pallide fulvo minime cinereo, corporis lateribus pallidius 

 fulvescentibus, fronte ciiierascente, nigredine pilei magis 

 restri cto minime ad nucham producto, dorso pallidiore griseo 

 vix nigro maculato, maculis albis in rectricibus externis magis 



