16 M. W. NIELSON 



Brachypterous form. Chile: Aconcagua Prov., 2 km S. Papudo, 2 $, 1 $, 18. xi. 1967 

 (L. &- C. W. O'Brien); Zapallar, 4 g, 3 9, 15.xii.1950 (Ross &■ Michelbacher); Coquimbo Prov., 

 Frey Jorge National Park, 15 km S.W. Pachingo, 100-200 m, 3 <§, 1 9, 20.X.1960 (E. I. Schlinger, 

 M. E. Erwin); 11 km N. Los Vilos, 1 ^, 2 $, 15.xii.1967 (L. &> C. W. O'Brien); Puerto Oscuro, 

 31 26' S., 71 37' W., sandy beach, 6 $, 23.xi.1966 (E. I. Schlinger); 4 km N. Punta Molles, 

 3 cT> 3 9> 12. xi. 1967 (L. cS- C. W. O'Brien); Valparaiso Prov., Algarrobo, 1 $, 31.xii.1967 (L. 

 6- C. W. O'Brien); 20km N. Concon, 1 (J, 5 9, 26.xi.1950 {Ross <&> Michelbacher). 



Subbrachypterous form. Chile: (no locality), 5 o*, 3 9- x. 1940 (E. P. Reed); Alconcagua 

 Prov., 2 km N. Cabildo, 1 $, 1 9, 28.xi.1950 (Ross & Michelbacher) ; Zapallar, 3 g, 3 9, 27. xi. 1950 

 and 1 9. i5-xii.i950 (Ross &> Michelbacher); Quillota Prov., Las Palmas, 4 £, 2 9. 20— 21.xii.1955 

 (Pena), Cobquecura, 33 <$, 26 9, i4- xnI 953 {L. E. Pena); Curanipe, 3 $, 3 9, 4-xii.i953 (L. E. 

 Pena); Nogueche, 2 (J, 4 9. I 5-xii.i953 (L. E. Pena); Pelluhue, 1 $, 2.xii.i953 (L. E. Pena); 

 Pta. Iglesia, 2 9. i4-xii.i953 (L. E. Pena); Tregualemo, 3 <$, 5 Q, 6.xii.i953 (L. E. Pena); 

 Valparaiso, 2 <$, 2 9 ( n o date) (E. P. Reed). Bolivia: Alcoche, Las Pas, Malaise trap, 600 m, 

 28 (J, 15 9. 17.xii.1966 (Baloch, Mahunka <&■ Zichsi). 



Biology. DeLong (1969) collected specimens in Chile from shrubs on bluffs 

 along the beach of the Pacific Ocean. Specimens examined showed that 

 collections were made from plants on sand dunes and sandy beaches. Populations 

 were prevalent from September to December. 



Remarks. Chilelana artigasi is the only known species in the genus and can be 

 easily distinguished from the nearest generic relative, Tinobregmus, by the long 

 semicircular aedeagus. The type-specimen is a subbrachypterous morph. The 

 two morphs of artigasi described above are so closely identical in genitalic characters 

 that I have elected not to describe the brachypterous form as a distinct species 

 from artigasi, inasmuch as both morphs are sympatric. Moreover, there are 

 no collection records for the period January to August, which when available 

 may suggest that brachyptery is the effect of changes in photoperiod and/or 

 temperature. Until sufficient supporting biological evidence becomes available 

 to the contrary, it seems best to consider both populations as identical species. 



Genus TINOBREGMUS Van Duzee 



(Text-figs 13-22) 



Tinobregmus Van Duzee, 1894 : 213. Tvpe-species : Tinobregmus vittatus Van Duzee, by 



monotypy (Van Duzee, 1894 : 2I 4)- 

 Tinobregmus Van Duzee; Metcalf, 1964 : 12. 

 Tinobregmus Van Duzee; DeLong, 1969 : 462. 



Small, robust brachypterous species. 



Colour uniformly stramineous to golden-yellow with apex of wings black in males, pale 

 irregularly stramineous to uniformly stramineous with or without black apical colour on 

 elytra in females. 



Head much produced anteriorly, more so than in Chilelana; crown broad apically becoming 

 very narrow basally, disk elevated; eyes large, not conspicuously swollen laterally; pronotum 

 short with anterior margin overlapping base of elytra, lateral carina in line with costal margin 

 of elytra; elytra as in Chilelana except forms are almost entirely subbrachypterous in males 

 and brachypterous in females, outer and middle anteapical cells closed; hind wings much 

 reduced, possibly nonfunctional in both sexes; clypeus long without median longitudinal carina; 

 clypellus produced beyond genae. 



Male genitalia slightly asymmetrical; pygofer with small projection on caudodorsal margin; 



