. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 166 bulletin: museum of comparative zoology 11. Caudal gills broad and flat, leaf-like Caudal gills not flat; rounded in cross-section and tapering to a point AMPHYPTERYGIDiE 302. 306 Figs. 302-311. Odonata, Nymphs 302. Synlestes, antenna of nymph (Tillyard) Synlestidse. 303. Isosticta, caudal gill of nymph (Tillyard) Protoneuridae. 304. iEschnid, antenna of nymph (Howe) iEschnidse. 305. iEschnid, lateral view of head, with labium closed (Howe) iEschnidse. 306. Tachopteryx, lateral lobe of labium (Ho
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 166 bulletin: museum of comparative zoology 11. Caudal gills broad and flat, leaf-like Caudal gills not flat; rounded in cross-section and tapering to a point AMPHYPTERYGIDiE 302. 306 Figs. 302-311. Odonata, Nymphs 302. Synlestes, antenna of nymph (Tillyard) Synlestidse. 303. Isosticta, caudal gill of nymph (Tillyard) Protoneuridae. 304. iEschnid, antenna of nymph (Howe) iEschnidse. 305. iEschnid, lateral view of head, with labium closed (Howe) iEschnidse. 306. Tachopteryx, lateral lobe of labium (Howe) Petaluridse. 307. Gomphid, antenna (Howe) Gomphidse. 308. iEschna, lateral lobe of labium (Tillyard) iEschnidse. 309. Plathemis, labium, open (Garman) Libellulidae. 310. Libellulid, lateral view of head, with labium closed (Howe) Libellulidse. 311. Cordulegaster, labium, open (Garman) Cordulegastridse. 12. Antenna? seven-jointed; tarsi of all legs three-jointed 13 Antennse four-jointed (Fig. 307); tarsi of front and middle legs two-jointed; mask with flat median lobe; distal margin of mentum not cleft GOMPHID.® 13. Labium forming a more or less spoon-shaped mask which covers the ventral and sometimes also the front surface of the head as far as the antenna; (Fig. 310); setse usually numerous. ... 14 Labium flat, not forming a spoon-shaped mask for the lower sur- face of the head (Fig. 305), almost always without seta; 16. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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