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Trox juglans is described as new from the Amazon Basin in Brazil, and new distribution records are given for Trox fulginosus Robinson, T. loxus Vaurie, T. punctatus Germar, T. tomentosus Robinson, and T. variolatus Melsheimer. O n l y t w o s p e c i e s o f Trox (T. suberosus (Fabr . ) and T. batesi H a r o l d ) a re k n o w n t o o c c u r in the f o r e s t s o f Braz i l ' s A m a z o n Bas in . Trox s p p . are n o t w e l l e s t a b l i s h e d t h e r e p o s s i b l y b e c a u s e t h e c o n t i n u a l , v e r y h u m i d f o r e s t c o n d i t i o n s are n o t s u i t a b l e o r because t h e y have been o u t c o m p e t e d in t h e i r e c o l o g i c a l ro le in t h e s e h u m i d f o r e s t s by o t h e r a n i m a l s s u c h as a n t s , f o r e x a m p l e . The s p e c i m e n s d e s c r i b e d as n e w here w e r e t a k e n at INPA 's Rese rva D u c k e , nea r M a n a u s , in an a rea o f t r o p i c a l h u m i d f o r e s t [terra firme; p r i m a r y f o r e s t ) and w e r e c o l l e c t e d by u s i n g ba i ted p i t f a l l t r a p s . The b a i t f o r t h e s e t r a p s c o n s i s t e d o f a s m a l l a m o u n t o f f i s h s u s p e n d e d above e i t h e r a 5 % ch lo ra l hyd ra te s o l u t i o n o r a 2 5 % p i c r i c a c i d s o l u t i o n . E igh t s p e c i m e n s w e r e t a k e n w i t h t h e t w o c o m b i n a t i o n s o v e r a n ine m o n t h p e r i o d in a s y s t e m u s i n g t e n t r a p s s p a c e d 50 m e t e r s apa r t and c o l l e c t e d w e e k l y . This s a m e area w a s a l so s a m p l e d w i t h b lack l i gh t t r a p s , b u t Trox s p . w e r e n o t t a k e n . T rox j u g l a n s , n e w s p e c i e s (Figs. 1-4) TYPE MATERIAL — H o l o t y p e m a l e , l abe led " B R A S I L : A m a z o n a s , Rese rva D u c k e , 26 k m NE M a n a u s , IX-27-1977, B. C. R a t c l i f f e . " A l l o t y p e f e m a l e w i t h s a m e da ta as h o l o t y p e . Four ma le and t w o f e m a l e p a r a t y p e s w i t h s a m e l oca l i t y da ta b u t w i t h d a t e s o f XI-1-1977, 1-3-1978, 1-17-1978, 11-14-1978, and V-2-1978. Types d e p o s i t e d a t t h e I n s t i t u t o Nac iona l de Pesqu isas da A m a z ô n i a ( I N P A ) . Para types d e p o s i t e d a t t h e M u s e u de Z o o l o g i a d a U n i v e r s i d a d e de São Paulo ( M Z S P ) . in the B r e t t C . R a t c l i f f e c o l l e c t i o n ( B C R C ) . and at the A m e r i c a n M u s e u m of N a t u r a l H i s t o r y ( A M N H ) . HOLOTYPE — M a l e . Leng th 8 . 0 m m ; g r e a t e s t w i d t h 4 . 5 m m . C o l o r l i gh t b r o w n . Head: F rons b i t u b e r c u l a t e . C l y p e u s w i t h apex t r i a n g u l a r , d e f l e x e d , a n t e r i o r edge d i s t i n c t l y e m a r g i n a t e in d o r s a l v i e w . Scape o f an tenna p i c e o u s w i t h f u l v o u s h a i r s ; c l u b f e r r u g i n o t e s t a c e o u s . Pronotum ( F i g s . 1 2 ) : Leng th w i d t h ra t i o 3 : 4 . Base d r a w n b a c k w a r d in o b t u s e l o b e . S ides b u l b o u s in f r o n t o f m i d d l e , s t r o n g l y e m a r g i n a t e in f r o n t o f basa l ang le , basal ang le a c u t e l y l o b e d ; m a r g i n w i t h s m a l l , s p a r s e h a i r s . C e n t e r o f p r o n o t u m w i t h 2 s t r o n g l y e l e v a t e d , l o n g i t u d i n a l r i d g e s ; r i d g e s e x t e n d f r o m apex t o base , c o n s t r i c t e d m e s a d j u s t b e l o w m i d d l e ; r i d g e s a t m e s a l c o n s t r i c t i o n appear s u b t u b e r c u l a t e in do rsa l v i e w ; a s h a l l o w

A new species of Trox from the Amazon Basin with new distributional records for Central American Trox (Coleoptera: Scarabaeidae)