192 THE entomologist's record. 



into two sub-segments, of which the anterior is much the wider. On the 

 metathorax, and on the abdominal segments, the anterior and posterior 

 trajjczoidals ai'c all placed in the dark sul)dorsal lines, and the Ijlaek 

 chitiuous points collected in this area hcl}) to give this line its darker 

 colour, the skin itself being rather brown than black ; the anterior and 

 posterior tubercles (i.e., i and ii) are united on either side into a raised 

 wart, of which the posterior only bears a few white and black hairs ; 

 the skin is covered with minute points, which only bear hairs on the 

 central jiortion of ( ach segment dorsally, the anal segment is, howevia-, 

 covered with hair-bearing bristles. The prolcgs are of the same reddish 

 colour as the ventral area of the larva, and cacli l)ears an outer flange, 

 with minute black hooks ; the chitinous parts of the true legs are black, 

 the softer parts reddish. 



After being './ithout food some three or four days, the larva com- 

 menced to spin its cocoon on the lid of the glass-l3ottomed box in 

 which it was confined. The cocoon is of the typical Authrocerid form, 

 23 mm. long and 7'5 mm. wide at the broadest part, rather thin, white in 

 colour, very shiny, and although it looks smooth to the naked eye, is 

 seen to be somewhat coarsely reticulated, under a two-thirds lens ; a 

 considerable quantity of loose, flossy silk is api)arent around the edge 

 in contact with the box upon which the cocoon is spun. 



The pupa is of a transparent greenish-black colour, emerging and 

 dehiscing in the well-known manner peculiar to the Anthrocerids. 



Notes on Hybrids obtained by crossing Tephrosia bistortata 

 with T. crepuscularia. 



By A. BACOT. 



With a view to obtaining hybrids between T. bistortata and 'T. 

 crepuscularia, I placed the pupae from some of the larvae described 

 (ante, })p. 177-179) in a warm room, towards the end of January, 1897. 

 The pupffi of T. crepuscularia, with which the exiieriment was made, 

 resulted from the ova which Mr. Hewett sent me from York. The $ 

 parents, which I received with the ova, were of the pale form, but 

 nearly half the moths which emerged from these pupaj were of the 

 dark form ab. delamerensis. 



The pupai of T. bistortata (which I used for the purpose of 

 obtaining crosses) were reared from ova laid by second-brood moths 

 from the Clevedon stock. They were kept in a cool entry facing east ; 

 its temperature is fairly even, cooler than the open air on a sunny day, 

 but of course warmer at night. 



The first specimens to emerge were two or three males of T. cre- 

 puscularia, early in the last week of February, and the T. bistortata 

 commenced to come out a day or two latt-'r. 1 obtained six pairings 

 between c? s of 7'. crepuscularia and $ s of T. bistortata -. three 

 between <? s of T. bistortata and $ s of T. crepuscularia ; also six 

 pairings of T. bistortata with T. bistortata, and three between (? s and 

 5 s of T. crepuscularia. Of these, four of the first, and all three of 

 the latter crosses, produced fertile ova ; while four of the T. bistortata 

 ])airings, and, so far as memory serves me, two of the T. crepuscularia 

 ])airing^ also resulted in fertile eggs (vide, detailed list of paii'ings). 

 All six pairs of <? T. crepuscularia with $ T. bistortata were seen 



