26 A. WATSON 



nearly at right-angles to costal margin of wing) ; veins marked with yellow or pale brown scales 

 proximal to yellow fascia in all species and distal to yellow fascia in all except klages and 

 albofasciata; venation as in Viviennea (q.v.). Hindwing entirely brown (fafner and cingnlata), 

 yellow with broad, brown margins (rutila and godmani), brown but sparsely scaled proximally 

 {albofasciata), or brown with white subbasal marking (klagesi); venation as in Viviennea 

 but Sc reaches margin of wing except in klagesi and albofasciata. Abdomen brown, or brown 

 with weak blue iridescence, and with broad, yellow lateral band on each side and on ventral 

 surface. 



O* genitalia [<$ cingulata and godmani not known]. Eighth abdominal tergite with short, 

 tapered apodemes; eighth sternite with short, broad, poorly developed apodemes. Saccus 

 small. Valve simple; saccular margin angulate; apex of valve weakly spatulate, tapered or 

 acuminate. Juxta well sclerotized. Apex of uncus simple or weakly bifurcate; preapical 

 region carinate dorsally; laterally dilated and ventrally flattened, the ventral flattened area 

 with transverse lip posteriorly. Aedeagus with or without small, single spine at apex on 

 same side as caecum penis; vesica with large, variously scobinate lobe, and one other small but 

 well differentiated, non-scobinate lobe on left side of aedeagus. 



$ genitalia [$ fafner, albofasciata and klagesi not known]. Seventh abdominal sternite 

 bifurcate posteriorly, emarginate medially. Lamella postvaginalis poorly developed; broadly 

 V-shaped. Ductus bursae sclerotized along whole of its length. Corpus bursae with two 

 small circular signa ; appendix bursae arising from right posterolateral region of corpus bursae. 

 Anterior and posterior apophyses present, the latter longer than former. Paired scent-glands 

 well developed. 



This genus shares many characters with the apparently closely related Viviennea. 

 The distinguishing features are listed under Viviennea: most readily discernible 

 are the longitudinally banded tegulae, the pale mid-dorsal thoracic line, the weakly 

 iridescent terminal abdominal segment, and the absence of a proximal yellow band 

 on the forewing, and the absence of a scent organ in the anal area of the hind wing. 

 There are also genitalic differences (see Viviennea). 



Of the six species now placed in Ordishia, two are not known from the male 

 (cingulata and godmani), while three are not known from the female (fafner, albo- 

 fasciata and klagesi). There are, however, sufficient external characters to justify 

 the association of these six species in one genus. All six species have been transferred 

 from Automolis. 



Ordishia is known from Guatemala, Costa Rica, Panama, Ecuador, Colombia, 

 Venezuela, Trinidad, French Guiana and Brazil. 



Two species at present placed in Rhipha (q.v.), persimilis and luteoplaga, may 

 not be phylogenetically distant from Ordishia but differ in several characters - 

 especially the forewing shape and the incomplete yellow fascia, and the attenuation 

 of the male genitalia. Idalus flavopiaga Schaus (1905 : 208) and Rhipha fiavopla- 

 giata Rothschild (1912 : 157) are externally similar in size, coloration and pattern 

 to persimilis but are probably not congeneric with it. A new genus has been 

 erected for another similarly patterned species, Amphelarctia priscilla (q.v.). 



At least one species of Ordishia (rutila) is known to be aposematic and to produce 

 the same type of protective behaviour as that described for species of Viviennea 

 (q.v.). As pointed out by Blest (1964), many other species of Arctiidae and Ctenu- 

 chidae have evolved a similar forewing colour-pattern in South America and Central 

 America and are probably members of Mullerian complexes. 



Nothing is known about the early stages. 



