Fia. 
. Map showing distribution of Brood XXIV, 1912 
. Map showing distribution of Brood XX VI, 1914 
. Map showing distribution of Brood X XIX, 1917 
. Map showing distribution of Brood XXX, 1918 
. Head and prothorax of Cicada, lateral view 
. Head of Cicada, front view, right mandible and maxilla drawn out-- 
. Head and prothorax of Cicada, lateral view, with parts separated to 
4. The periodical Cicada, side view, showing beak and ovipositor 
. Abdomen of female, showing ovipositor and attachments ......-.---- 
b. Tip-of evipositor, much enlareedie 25.28.2522 ceee See ae ee ee 
. Cross section of ovipositor 
. The musical apparatus of the periodical Cicada 
9. Pupal galleries ef tthe:Cieaday.\ 25) 22k ie ed es es 
0: Sit holies ini ‘poids. 22 Saou ces Soo SS ened shee eee Sed Pee ee ee Ente 
. Twigs showing egg punctures and illustrating manner of breaking 
42. 
. Cicada scars in hard-maple twigs after seventeen years........----..--- 
. The egg nest of the Cicada, showing nature of wound and arrangement 
ILLUSTRATIONS. 
SIO We BELT CULM fk cosa ec eee tee ee 
Twig showing scars from punctures after the second year....-....-.---- 
OPERAS GE: Sele HS, SES =e. eS Mee ee nel hh oe eR Rete 
5. Egg, much enlarged, showing young about to be disclosed. ......-...- 
. Newly hatched larva, greatly enlarged...........-..-.-----+------- 
. First larval stage, illustrating the larva at the beginning and end of 
Ghai S/Staeet son See hes ieee Soe Se ee ee eed: Beene 
. Second larval stage, illustrating the structure of the anterior leg. -...... 
. Third larval stage, illustrating the structure of the anterior leg... ..- . 
. Fourth larval stage, illustrating larva and structure of anterior leg. -- - 
51. First pupal stage, illustrating the structure of the anterior leg.....-..-. 
2. Cecidomyiid ‘ege parasite of the Cicada =... 2. 2..2- oa see ene eee 
3. Wipe parasite, Lathromems ercadac 2. .s 2 is. 2 222 ah eae oes 
. Female Sphecius (digger wasp) carrying a Cicada to her burrow....-. 
. Diagram of the burrows of the digger wasp........-.-----.---------- 
. Cicada tibicen with wasp egg attached to thorax..........--....--.-- 
. Full-grown larva of the digger wasp in its burrow feeding on a Cicada. . . 
. Larva of digger wasp with anatomical details: pupa of same, front and 
Tatteralivilewse. Dee oe Pee cme nee tne eee re he eer eee eee 
. Digger wasp larva constructing its cocoon. -°>--- oo: - oe eee 
. Cocoon of digger wasp, with enlarged section of breathing pore... -.-. 
| Mite-ege parasite, Oribatella spsut 2-2. oe ee es ee ee 
~Mite:ege parasite; Oripoda elongata. =) 322 ec ea ee ee 
3: Mite ege parasite, Oppia pilosa: 32 --o 2 ae ee ce ae A ee 
. Mite egg parasite, Pediculoides ventricosus. 2... <2 -- 5 22-- 2 ee 
65. 
66. 
; Mite ege: parasite, Cheyletus spo 222e. See. s fee mtg ee ea ere 
68. 
Mite ege parasite, Tyroglyphus cocciphilus ....-.-.-..---------------- 
Mite ‘ego. parasite, Ponts Ovalis ic Stas ee ee eae ee ee ee 
Mite ege parasites Bdella spe i252 eee sta ane oes ee eee 
~I1 
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82 
83 
92 
100 
106 
106 
108 
109 
i 
112 
118 
119 
120 
120 
PAL 
129 
130 
130 
ial 
131 
132 
132 
138 
134 
134 
134 
135 
136 
136 
137 
137 
138 
