596 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.57. 



Division II, p. 612 (4 ocelli) : 



Genus 9. Tarsostenus, p. 612 (unipiiUate; large intersegmental mem- 

 brane; basal plate distinct). 

 Division III, p. 614 (3 ocelli) : 



Genus 10. Cymatodera, p. 614 (spotted; orange punctures). 

 Division IV, p. 617 (1 or no ocellus) : 



Genus 11. Orthopleura, p. 617 (swollen; no basal plate). 



Genus 12. Monophylla, p. 618 (elongate; basal plate disti-ict). 

 SUBFAMILY G, p. 619 (second antennal joint large). 



Genus 13. Priocera, p. 619 (ninth abdominal segment enveloped by coni- 

 cal, asperse cliitinization ; cerci small, fused basally). 

 SUBFAMILY D, p. 620 (well developed epicranial suture). 



Genus 14. Thaneroclerus, p. 621 (median gular tubercle). 

 SUBFAMILY E, p. 622 (frons posteriorly with straight, transversal margin). 



Genus 15. Hi/diioccra, p. 622 (apical and supplementary joints of anten- 

 nae liirge). 



C. e. KEY TO GENERA OF FULLGROWN NORTH AMERICAN CLERID LARVAE. 



1. Frons postei-iorly limited by a transverse Mne^^ Hydnocera, p. 622. 

 Frons posteriorly angulate 2 



2. Epicranial suture, well developed Thaneroclerus, p. 621. 



Epicranial suture, not well developed 3 



3. All spiracles bifore; two ocelli Necrobia, p. 597. 



Anterior or all spiracles aunuliform or pseudo- 



annuliform 4 



4. Antenna with large second joint ; ninth ab- 



dominal segment conical, asperse, biiid Priocera, p. 619. 



Antenna with small second joint 5 



5. One or no ocellus 6 



More than one ocellus 7 



6. No basal plate; tumid body Orthopleura, i^. Qll. 



Distinct basal plate; elongate body Monophylla, p. 618. 



7. Three ocelli Cymatuda-a, p. 614. 



More than three ocelli 8 



8. Four ocelli ; sixth and seventh abdominal seg- 



ment ampullate; basal plate distinct Tarsostenus, p. C12. 



Five ocelli 9 



9. Gula comparatively short, ventral mouth parts 



somewhat retracted, body very hairy Trichodes, p. 611. 



Gula elongate 10 



10. Membranous parts of body with faint bluish 



tint on exposed areas or white; basal plate 



indistinct or absent 11 



Membranous parts strongly colored ; basal plate 

 distinct i 13 



11. With cerci 12 



Without cerci j Neichuea, p. 610. 



12. Basal plate laterally rectilinear; body finger- 



shaped Chariessa, p. 608. 



Basal plate not present; body elongate, worm- 

 shaped Phyllohaenvs, p. 609. 



13. Body colored, with whitish pattern ; chitiniza- 



tion of cardo occupies half or less of entire 



cardo surface Galcriiclcrus, p. 60G. 



Body of one strong color throughout; chitiniza- 

 tion of cardo occupies two-thirds or more of 

 entire cardo surface 14 



14. Each epicranial half with a dorsal tubercle Enoclervs sphefieus, p. 604. 



Each epicranial half without any dorsal tubercle-15 



15. Cerci corniform, with long gradually pointed 



end, or clubshaped with .short abruptly con- 

 tracted end J Enoclerus. a 602. 



Cerci like the horn of a chamois, cylindrical 



with rather short, much recurved, pointed •r'n.L 'i'>!^i}>'!<i'nus. p. 601. 



