ake Mr. F. W. Edwards on the 
*luteipes, 46, 
*maculiventris, 34. 
maindroni, 49. 
*marginata, 31. 
melanoecephala, 39. 
melanura, Kollar § Redt., 41. 
*nilgirica, 26. 
*nitida, 50. 
pallidicolor, 60. 
*varipes, 56. 
*virescens, 15. 
viridescens, 19. 
viridipennis, 17. 
*viridivittata, 33. 
SyNONYMS and VARIETIRFS. 
brevicornis (Prionocerus), 1. 
ceeruleatus, 18. 
cardoni, 44 
ceylonica, 39. 
diversipennis, 25, 
forticornis (Prionocerus), 1. 
fuscipennis (Prionocerus), 1. 
melanura, Muls. § Bourg., 40. 
metallescens, 19. 
notaticollis (Prionocerus), 2. 
tripartita, 2. 
*plectrophora, 1. 
*yostrifera, 48. 
rouyeri, 23. 
*semitecta, 38. 
terminata, 3. 
*triserrata, 16. 
*uncigera, 29. 
*ungulata, 12. 
*yvaricornis, 54. 
EXPLANATION OF PLATES XI. & XII. 
Figs. 1-49. Profile views of the ¢ genital armature of species of 
Prionocerus and Idgia, one only of the lateral lobes shown and the 
free tubular median lobe lowered from its normal position, so that 
a clearer outline could be given of it, the apical portion of the sac 
(when visible in the dried specimens) added; 9a and 10a, dorsal 
views of 9 and 10, the median lobe omitted in 9a; 49a, sixth 
ventral segment of JL. pallidicolor, g; 50, apices of elytra of 
I, uncigera, 2; all X 12. In fig. 46 the median lobe is out of its 
normal position, and shown from the ventral aspect. 
XXXIV.—<A Note on the Egg-burster of Eucephalous 
! Fly-larve. By F. W. Epwarps. 
In widely separated divisions of the animal kingdom special 
embryonic organs are found whose function is to facilitate 
the hatching of the embryo from the egg. Everyone is 
familiar with the hard knob which occurs on the tip of the 
upper jaw in the chick as well as in other oviparous 
vertebrates. Among the Insecta egg-bursting organs are 
often found on the dorsal surface of the head, and assume 
a variety of forms. Different types have been deseribed by 
Packard (‘Text-book of Entomology,’ p. 585), Berlese 
(‘Gli Insetti,” vol. 2, p. 218), and Williams and Buxton 
(Trans. Ent. Soc. London, 1916, p. 88). In other cases 
these organs appear to be part of the amnion rather than of 
the embryo itself; instances of this are given by Riley 
(vide Packard, Text-book, p. 585) and Kershaw (Bull. 
Trinidad Dept. Agric. xii. 1913, p. 94). 
