of the Genus Lithocolletis. clxiii 



detects the inhabited leaf from above, even when the pulp of the leaf 

 has not yet been eaten. The abode is consequently large and irregu- 

 lar, the excrement not collected into a heap, and the pulp of the leaf 

 is irregularly eaten at the margins, and in patches in the middle. The 

 larva itself is rather large, fully one-third of an inch long. The food 

 showing through, gives the back a pale green longitudinal line ; if the 

 larva is full grown and preparing to change to the pupa, it expels all 

 the excrements and unnecessary juices from its body, and then ap- 

 pears entirely of the ground colour, which is yellow. The head is 

 small. The larva is an exception to all others of this genus in its form, 

 not being broader in front than behind, being gradually pointed from 

 the middle to the head. The beautiful, clear, pale brown, rather large 

 pupa, with a pointed and black-spotted head-end and long back- 

 sheath,* which is continued nearly to the caudal extremity, reposes 

 in a very firm, thick, papery-like cocoon, of dark green colour and 

 oval form, which is only loosely fastened in the leaf. 



I collected several hundred pupae, but obtained therefrom not a sin- 

 gle specimen, since they all dried up. From three or four pupae, col- 

 lected later at Falkenwald, I obtained, on the 26th of February last 

 year, a single female specimen. There are two broods, but I do not 

 know the period of flight of either. 



19. L. tristigella,f Haw. Minor, alls anterioribus satwate-cro- 

 ceis ; fantennis albis fusco annulatis, ante apicem albidis) ; 

 strigis duabus curvatis ant subfractis strigulisque tribus costce, 

 duabus dorsi argenteis, introrsum fusco marginatis, apice atro 

 squamato. 

 Var. b. Alis anterioribus vix croceis, sed aureis. 



Argyromiges tristigella, Haw. Stain ton, Zool. p. 2087, 8, f. 9. 



Lithocolletis tristigella, Stainton, Syst. Cat. p. 31. 



This species, the nearest allied to L. Frolichiella, would be difficult 

 to distinguish from it, did not the difference of size render it so easily 

 recognizable. L. Frolichiella is the largest species of the genus, L. 

 tristigella is hardly so large as L. ulmifoliella. 



Face, palpi, antennae, legs and abdomen as in the allied species ; 

 tuft of the head dark loam-yellow ; in L. Frolichiella the tips of the 

 hairs of the head are usually pale yellow. 



The anterior wings are not quite so deep a colour as in L. Frolichi- 



* Query, tongue-sheath. ? I suspect a misprint of Rucken for Riissel. — IT. T. S. 

 f Not Tristrigella, Haw., St., Sta., but a new species, very closely allied to Froli- 

 chiella, and for which Herr Zeller suggests the name Nicellii. — H. T. S. 



