172 r August, 



tlian the rest of the dorsum. The whole upper surface is i^i^read with 

 Httk^ white glistening "crow's-foot" hairs, each arising in a minute spot 

 of black pigment, which is only seen with higher powers of Innoeular 

 dissecting microscope. 



The segment behind the honey-gland (eighth on the alxlominal 

 segment) has a big j)apilla out on the Hank. The base of this papilla is 

 covered as usual with crow's-feet growing from black specks, the summit 

 consisting of a bladder of thin, greenish, pulsating membrane. 



Pulsation is not rhythmical, and not dejiendent on movements of 

 tlie head in feeding. Two sides pulsate at different rates, ])ulsations 

 entirely irregular in amplitude and frequency, prol)ably averaging several 

 per second. Quite suddenly one ]iapilla gives two or three luige jmlsa- 

 tions and a long |)illar is evaginated with glistening apical s])ines, the 

 whole quite visible to the naked eye. It is soon invaginated again. 



The height of the pillar is approximately six times its dianieter. 

 The under surface is of the same colour as the u]»]:)er; no crow's-foot 

 hairs. The legs are almost colourless. The head is trans] lan-nt greenish, 

 eyes black. Labrnm red-brov>n, ti])s of gnathites ditto. Lengtli, 11 mm. 



in all stages but the hist the larva only difl'ers from tlie al)ove in 

 having the middle of the dorsal streak on thorax yellow, not red-brown. 



EXPLANATION OF PLATES. 



Tiifiiciis vu'diU'rranene 15. l?aker. 



Platf. YI. — Fig.]. P]gg-shell, X 38. Fig. L\ Larva of Tarucus tkcophrasfus, 

 or more probably T. meditcrraneae (i'rom Sebdou, Oian, Algeria), in 

 first stage, X 42 ; the intestine lias been everted from the last segment 

 in placing specimen on slide ; all the other specimens are 7'. 7nedi- 

 terrcmeae from Mesopotamia. Fig. 3. Second stage larva. X 42. 

 Fig. 4. Third stage larva, X 17'o. 



Plate VJI. — Fig. 5. One of the ibirsal hairs of tlurd stage larva, x 170. 

 Fig. 6. Fonrlli stage larva, X 10. Fig. 7. Fifth (last) stage larva, X 10. 

 The difference in size of tlie larvae in the last two tigares is due to the 

 greater stretching of the larger skin. The relative sizes of the caltrops, 

 liair-bases, and of the heads seem to couhrni the determination of ti e 

 instars. 



Plate VIII. — Fig;. 8. Prothorax and prothoracic plate of larva in tig. 7 ; the 

 bases of the special angular hairs of the plate are very conspicuous, x 42. 

 Fig. 9, Last segments of same larva, X 41 ; tlie honey-gland and position 

 of the " pillars " are evident. 



Platk IX. — Fig. 10. lloney-gland region of same larva, more magnified 

 (X 120) ; this figure and fig. 5 show the various forms of lenticles and 

 hair-bases (•' crow's feet," Buxton) ; the minute hairs will hardly 

 persist in tlie reproduction. Fig. 11. Ocelli and ja^As in last larval 

 iu>itar, X 70. Fig. J2. The same in third iustar (larva in fig. 4), X 120. 



