REVISION OF COELIDI1XAE 21 



appendix well developed, venation as in description of tribe; face long, clypeus and clypellus 

 as in description of tribe. 



Male genitalia symmetrical; pygofer in lateral aspect with a distinctive long process on 

 caudal margin, caudal margin bilobed and/or caudodorsal margin produced distally to a narrow 

 lobe; aedeagus articulated basally with connective, long, sinuate or tube-like, with or without 

 accessory processes and teeth on shaft, curved apically in lateral aspect; go no pore ventral 

 and subapical; style well developed, long, narrow, curved laterally, sometimes straight, with 

 or without subapical projection or processes; connective small, broadly Y-shaped without 

 stem; plate long and narrow, sometimes broad medially. 



Female seventh sternum with posterior margin slightly produced. 



Sandersellus, originally monotypic, is now a polytypic genus with eight species, 

 all remarkably similar in general habitus. The type-species of Cixidocoelidia 

 (C. truncatipennis Linnavuori, Bogota, Lindig, 'n.g. et n. sp.', 'Cixidocoelidia 

 truncatipennis n. sp.', 'typus') in the Naturhistoriska Riksmuseum in Stockholm 

 was examined. The type-specimen is a female and was generically associated 

 with a paratype male specimen of Sandersellus carinatus DeLong. C. truncatipennis, 

 known only from the holotype female, is excluded from the key. The genus is 

 known only from South America. 



Key to the species of SANDERSELLUS 



(Males) 



i Pygofer in lateral aspect with caudal margin produced distally to a single 



caudodorsal lobe, pygofer process arising under or near ventral margin of 

 lobe (Text-figs 24, 27, 33, 39) ......... 2 



- Pygofer in lateral aspect with caudal margin bilobed, pygofer process arising 

 between lobes (Text-figs 45, 53, 58) ........ 5 



2 (1) Aedeagus in lateral aspect with margins of shaft not parallel, shaft broad basally 



(Text-figs 32, 38, 43) ; style in dorsal aspect with length slightly exceeding 



apex of aedeagus (Text-figs 28, 34, 40) ....... 3 



- Aedeagus in lateral aspect with margins of shaft parallel throughout (Text-fig. 



26) ; style in dorsal aspect with length greatly exceeding apex of aedeagus 

 (Text-fig. 25) ...... carinatus DeLong (p. 22) 



3 (2) Aedeagus in lateral aspect with barbs or serrations on shaft (Text-figs 38, 43) ; 



pygofer in lateral aspect with caudodorsal lobe hooked apically (Text-figs 33, 



39) 4 



- Aedeagus in lateral aspect without barbs or serrations on shaft (Text-fig. 32) ; 



pygofer in lateral aspect with caudodorsal lobe broadly truncate apically 

 (Text-fig. 27) ....... simplex sp. n. (p. 23) 



4 (3) Pygofer process serrate distally (Text-fig. 33) ; aedeagus in lateral aspect with 



ventral margin serrate (Text-fig. 38). . . . delongi sp. n. (p. 24) 



- Pygofer process bluntly pointed apically (Text-fig. 39) ; aedeagus in lateral aspect 



with numerous lateral barbs on shaft (Text-fig. 43) . ornatus sp. n. (p. 26) 



5 (1) Aedeagus with processes or teeth on shaft (Text-fig. 56); style with irregular 



shaped teeth or small projections subapically (Text-fig. 59) ... 6 



- Aedeagus without processes or teeth on shaft (Text-fig. 52) ; style without teeth 



or projections (Text-fig. 51) . . . . . linnavuorii sp. n. (p. 27) 



6 (5) Pygofer process short, broad basally with a sharp spine-like projection apically 



(Text-fig. 53); aedeagus with a pair of broad, toothed processes arising 



