1988] 
Wolfe — Hydrovatus methlini 
333 
Table 2. Synopsis of plesiotypic and apotypic characters used in analysis. Unless 
otherwise indicated characters are from the adult stage. See Wolfe (1985) for com- 
plete details and illustrations for characters 1-18. Character 19 illustrated herein. 
Character Plesiotypic state Apotypic state 
Mandibles 
Labial spines 
3. Larval nasale 
ventral medial setae present 
in multiple rows, spines 
smaller 
absent 
4. Larval galea present 
5. Prosternum not declivous 
6. Prosternal pore absent 
7. Scutellum 
8. Elytral ridge 
exposed 
reduced, not carinate 
9. M4 vein 
10. Base of meta- 
furca 
11. Proventriculus 
12. Protarsomere 
13. sublateral row 
of spines of 
mesotibia 
14. Proximity of 
metafemur to 
metacoxal 
process 
contacting obiongulum 
not produced and cleft 
sclerites of sulci with longi- 
tudinal ridge and/or teeth 
pentamerous 
sparser (state 0) 
touching to 
scarcely separated 
ventral medial setae absent 
in single (at most double) row, 
spines larger 
present 
1 — without notch 
2 — with notch 
absent (reduced in Methilini) 
declivous 
present 
concealed 
present 
1 — carinate 
2 — slightly posteriorly 
elevated 
3 — distinctly posteriorly 
elevated 
4 — iiguiate 
not contacting obiongulum 
produced and dorsally cleft 
3 — indistinctly developed 
2 — distinctly developed 
sclerites of sulci with transverse 
teeth 
pseudotetramerous 
1 — indistinctly pseudo- 
tetramerous 
2 — distinctly pseudo- 
tetramerous 
states I to 3, indicate 
increasing density 
distinctly separated 
15. 
Valvifer 
present 
absent 
16. 
Apodeme of 
genital valves 
absent 
present 
17. 
Posterior apex 
of body 
not acuminate 
acuminate 
18. 
Larval 
urogomphi 
short 
long 
19. 
Posterior 
not apically acute 
l-tergum-8 only modified; 
tergite 
and bilaminar 
acute and bilaminar 
2-tergum-7 and 8 modified; 
tergite-8 sclerotized, trifid 
and spear shaped 
