_ DESCRIPTIVE CATALOGUE. 



8 



ntV, „n the surface, in one subdivision only marked with prominent 

 posterior ^^^^^SLm of moderate length, straight, either filiform 

 transverse scut _lnjhpe 1 fect ^ ^ ^ slightly attenuated at both 



at the base, T^*^^,^ in thickness from the base to the point without 

 ends; « «^ «^^ a short a L pt point (as in Amblypodia Lonainus, PL iv. fig. 5 

 )-Xt ^^"t^inallcasestLLges, *+i longer than the head; basal 

 ^thon concave, somewhat broad, applied to the head, closely covered wuh scales among 

 thich few or more numerous hairs are scattered; second joint long straight, beyond [the ^ 

 detached from the head, abruptly terminated, closely covered with minute scales, among wh ch 

 hairs are dispersed, varying in character, number, and density, in different specaes ; third joint 

 tending forwards, short, abruptly attached and smaller than the second, oblong or attenuated, 

 nearly naked, downy or covered with minute delicate scales. Probosns more than double the 

 length of the palpi, beset at the extremity with delicate patulous bristles. Head short, obtuse, 

 broad. Eyes moderately prominent, plane and covered with a delicate down. Wwgs : antenor 

 oblong, short, obtuse; posterior elongated with rounded margins or narrower towards the anal 

 extremity, slightly sinuated, tailed, and provided with an anal appendage, or bearing short, 

 oblong distinct lobes, resembling obtuse denticulations : discoidal areola not closed. Feet: ante- 

 rior, of the male, with a tarsus, consisting of a single cylindrical joint, with two lateral, and an 

 intermediate series of spines, longitudinally arranged underneath, either terminated by a single 

 claw or altogether obtuse, with an abrupt vertical warty surface at the extremity ; of the female, 

 with tarsi, consisting of five cylindrical joints ; the first long, the second, third, and fourth, 

 short, the fifth somewhat thickened and armed with two short strongly arcuated claws; two 

 short filiform appendages and a pulvillus, occupy the middle of the foot, the whole being 

 covered and nearly concealed from view by numerous short villi. The tarsi of the middle 

 and posterior feet are all provided with five joints, the terminal one being armed with two 

 claws, which, in the mid-leg, are concealed by the extreme scales ; and the femur of the same 

 leg has a short acute spine, as in Polyommatus and Lycama. 

 This genus is illustrated, on the fourth plate, by the metamorphosis of Thecla Xenophon ; fig. 2 ; 2, 

 a : of Amblypodia Apidanus ; of Amblypodia Narada ; fig. 3 ; 3, a : fig. 4 ; 4, a ; and of Ambly- 

 podia Longinus ; fig. 5 ; 5, a : on the same plate the dissections of Thecla Xenophon, fig. 2, b ; 2, 

 c ; 2, d ; 2, e ; and of Amb. Longinus, fig. 5, b ; 5, c ; 5, d ; 5, e ; are also given. 

 In the analysis of the Javanese species of Thecla I have continued the careful examination of the anterior 

 feet, with the view to determine the accuracy of my former observations on the genera Polyommatus and 

 Lyccena. As far as regards the peculiarity of these organs in the sexes, my researches have not only essen- 

 tially confirmed my former remarks, but they have led to the determination of two prominent types of form, 

 which are confirmed by other organs, particularly by the antennae. The genus has accordingly been divided 

 into two subgenera, the first comprising the true Theclce, with clubbed antennae, the second those species in 

 which the antennae gradually and uniformly increase in thickness from the base to the point without any 

 distinct club : the latter, from the structure of the feet, has been named Amblypodia. The metamorphosis, 

 as far as it has hitherto been observed, confirms these subdivisions ; aud the illustrations given on my fourth 

 plate (as referred to above) tend also to show the accuracy of the authors of the Wiener Verzeichnis. The 

 family O (p. 185), comprising the European Thecla, has been named Depressoscutata ; and this is also the 

 true character of the larvae of the Theclce found in Java. As far as regards the structure of the anterior feet 

 and the sexual modification of character assigned to them in the generic description, I have to state in this 



place, 



