June, 1912.] Life-Hutories of Syrphidar IV. 541 



9 . Front shining Ijlack, yellow on the sides below; 

 yellow lateral stripes of thorax extending only to the suture. 

 Abdomen moderately broad, shining black with the extreme 

 lateral margins continuously yellow and a moderately arcuate, 

 entire, 3'ellow band, reaching the yellow on the sides, on each of 

 the segments from two to four inclusive. These bands cover about 

 one-third the length of the segment. Fifth segment with a similar 

 but slenderer yellow band interrupted in the middle. Sixth seg- 

 ment yellow with some black on the disk. In other respects as 

 in the male. 



EXPLANATION OF PLATE XXX. 



Figures 61-70 Allograpta obliqua (vSay). 



Fig. 6L Egg from the .side x 20. 



Fig. 62. Dorsal view of egg x 20. 



Fig. 63. A small part of the surface of egg-shell showing sculpturing, 

 highly magnified. 



Fig. 64. Adult 9 about 7 times natural size. 



Fig. 65. Larva, 12-24 hours after hatching x 50; a, antenna; b, internal 

 oesophageal framework; c, posterior respiratory organs. 



Fig. 66. Mature larva x9; a, antenna; b, position of anterior spira- 

 cles; c, posterior respiratory appendages. 



Fig. 67. Antero-ventral view of the head of the larva, much enlarged; 

 a, antenna; h, upper jaw;c, outer pair of mouth-hooks; d, the two pairs of 

 lateral mouth hooklets; e, chitinous oesophageal framework (internal); 

 /, lower jaw. 



Fig. 68. End view of posterior respiratory organ x 200; n, one of the 

 six elongate spiracles, b, the dorsal, circular plate; c, c, the interspiracular 

 spines. 



Fig. 69. Dorsal view of puparium x 5; a, posterior respiratory 

 appendage. 



Fig. 70. Outline of puparium from the side x 3.5; o, posterior 

 respiratory appendage. 



Figures 71-78 SphaeropJwria cylindrica (Say). 



Fig. 71. Drawing of the adult male from the side x 7. 



Fig. 72. Terminal part of mature larva x 60, showing respiratory 

 apparatus; a, slit-like spiracles; b, dorsal circular plate. 



Fig. 73. End-view of posterior respiratory appendage x 120; lettering 

 as in Fig. 72. 



Fig. 74. Side view of anterior respiratory appendage, highly magnified. 



Fig. 75. The same from the end, showing teeth-like lobes. 



Fig. 76. The larva from the side .x 5; a, posterior respiratory 

 appendage. 



Fig. 77. Antero-ventral view of head segments, much enlarged; a, the 

 antenna; b, the upper jaw; c, the two pairs of mouth-hooks close beside the 

 jaws; d, the outer pair of mouth-hooks; e, chitinous oesophageal framework 

 (internal);/, lower jaw. 



Fig. 78. Outline of puparium from the side x 7.5; the dotted lines 

 indicate several variations in the shape of puparia. 



