RURALIDES. 305 



In 1804, Latreille (Noitv. Diet. Hist. Xat., xxiv., pp. 184-185, pp. 

 199-200) gives a series of genera with their respective types, of which 

 one is — 



Genus Polyommatus — Hesperia argus, Fb. 



In 1805, Latreille (Hist. Nat. Crust, et Ins., xiv., pp. 116 et seq.) 

 uses the genus Polyommatus with exactly the same force as Cupido, 

 Schrank. He does not even go so far as Schrank in making any 

 subdivisions. In its inception, therefore, Polyommatus, Latr., like 

 Cupido, Schrk., is identical with Rurales, Linn. Latreille's genus is 

 diagnosed as follows : — 



Inner margin of hindwings forming a trough for reception of abdomen. Palpi 

 naked at end. Claws of feet very small, hardly perceptible — Polyommatus betulae, 

 Linn., querciis, Fab., pruni, Fab., boeticus, Fab., rubi, Linn., argus, Fab., adonis r 

 Fab., meleager, Fab., cor y don, Fab., avion, Fab., erebus, Fab., cyllarus, Fab., acis, 

 Fab., argiolus, Fab., alsus, Fab., myopa, Geoff., xanthe, Fab., phlaeas, Fab., 

 virgaureae, Fab. 



As illustrating the genus Polyommatus, he figures P. corydon (pi. cvii.,. 

 figs. 1-2). 



In 1806, Hiibner published his Tentamen, in which only one detail 

 is of importance here, viz., the creation of the genus Rusticus with 

 type argus, Hb. nee Linn. 



In 1807, Fabricius published {lllig. Mat/., vi., pp. 285 et seq.) his 

 classification of the butterflies. In this he subdivided the Rurales into 

 several groups, of which those that concern us here, are : — ■ 



Hesperia. — (a) Hesperia amor, helius, faunus. 



(b) H. vulcanus, marsyas. 



(c) H. boetica, aemon. 

 Lycena. — (a) Hesperia mars, echion. 



(b) H. amyntas, rubi. 



(c) H. meleager, arion, corydon, adonis, ledi, virgaureae, phlaeas^ 

 Thecla. — Hesperia betulae, spini, querciis. 



In 1809, : ' Latreille (Gen. Crust, et Insec, iv., p. 206) gave the 

 following dissective diagnosis of his genus Polyommatus — 



I. Alae posticae caudatae vel dentatae, sinuatae, aut saltern ad angulum analem 

 productae. 



(1) Genus Thecla, Fab. — Pap. betulae, spini, cerasi, querciis, etc. 



(2) Genera Hesperia et Lyc^na, Fab., Pap. boeticus, meleager, rubi r 



phlaeas, virgaureae, etc. 



II. Alae inferiores margine postico integro, deutibus caudisve nullis. 



(1) Genus Lyc^ena, Fab. — Pap. argus, corydon, alsus, etc. 



In 1810, Latreille (Consid. Gen., etc., p. 440) places under the 

 French name " Polyommate," betulae, querciis, boeticus, argus, de Fab. 



In 1815, Leach (Edin. Encycl., ix., pt. 1, p. 135) gave the Lycaenida 

 as family II of the Papilioniies, and grouped them under two genera 

 as follows : — 



Thecla. — T. betulae, pruni, querciis. 



Lycena. — (a) L. dispar, chryseis, virgaureae, phlaeas, rubi. 



(b) L. corydon, adonis, dorylas, argus, idas, artaxerxes, alsus r 

 argiolus, cymon. 



In 1816, Dalman (Vetens. Acad. Handl., pp. 48 et seq.) named his 

 Phalanx IX, Zephyrus, another name that had practically the same 

 comprehensive value as the Linnean Rurales, the Schrankian Cupido and 

 Latreille's Polyommatus. He subdivided, however, Zephyrus, into the 

 following sections : — 



* Scudder wrongly gives the date as 1807 (Hist. Gen. Butts., p. 253). 



