Larval Morhology Of Hydrotarsus Falkenström: Generic Characteristics, Description Of H. Compunctus (Wollaston), And Analysis Of Relationships With Other Members Of The Tribe Hydroporini (Coleoptera: Dytiscidae, Hydroporinae) Author Alarie, Yves Department of Biology, Laurentian University, Ramsey Lake Road Sudbury, Ontario, P 3 E 2 C 6, CANADA Author Bilton, David T. Plymouth Environmental Research Centre (PERC) Department of Biological Sciences, University of Plymouth Drake Circus, Plymouth PL 4 8 AA, UNITED KINGDOM text The Coleopterists Bulletin 2001 2001-09-30 55 3 341 350 http://dx.doi.org/10.1649/0010-065x(2001)055[0341:lmohfm]2.0.co;2 journal article 304899 10.1649/0010-065X(2001)055[0341:LMOHFM]2.0.CO;2 f5fee6a4-c703-4c1e-98d7-a0578adf73a6 10102577

Table 2. Selected ratios of third instars of Hydrotarsus Falkenström (HDT), Hydroporus Clairville (HDR) and Sanfilippodytes Franciscolo (SAN); n = number of species studied.
Features1	Genera
Features1	HDT (n = 1)	HDR (n = 15)	SAN (n = 1)
1 Ant, antenna; FC, frontoclypeus; Lb plp, labial palpus; Mx plp, maxillary palpus; otherwise as defined in Alarie (1997) and Alarie et al. (1997).
HL/HW	1.11–1.13	1.06–1.27	1.27
Ant L/HW	0.56–0.61	0.61–0.74	0.64
Ant L/Mx plp L	1.17–1.26	1.15–1.49	1.13
Mx plp L/Lb plp L	1.14–1.24	1.00–1.29	1.20
A2 L/A3 L	0.98–1.04	0.84–1.18	0.91
A3′ L/A4 L	0.56–0.63	0.59–0.85	0.89
MX2 L/MX1 L	0.81–0.85	0.74–1.01	0.95
LB2 L/LB1 L	0.96–0.97	0.96–1.25	1.15
FC L/HL	0.76–0.77	0.75–0.80	0.75
Metaleg L/HW	2.17	2.37–2.64	2.51
Siphon L/LASL	0.17	0.25–0.41	0.37
Uro1 L/LASL	1.42–1.49	0.75–1.86	1.18
Uro (1 + 2) L/LASL	3.10–3.31	1.49–3.73	2.62
Uro1 L/HW	0.71	0.62–1.09	0.81
Uro (1 + 2) L/HW	1.55–1.57	1.18–2.19	1.79
Uro1 L/Uro2 L	0.82–0.84	0.88–1.29	0.81
Uro1 L/Uro2′ L	0.86–0.88	0.91–1.37	0.90
LASL/HW	0.47–0.50	0.54–0.83	0.68