THERMONECTES. | 45 
by Belt is remarkable from its short form, and by the coloration of the thorax being the . 
same as in the Colombian 7. depictus. These facts render it probable that this latter 
supposed species will prove to be a variety of T. circumscriptus. 
6. Thermonectes cuneatus. 
Thermonectes cuneatus, Sharp, Trans. Roy. Dubl. Soc. n. s. 1. p. 682. 
Hab. PANAMA. 
A second female, agreeing with that originally described, is in Mr. Godman’s collec- 
tion; but the male remains still unknown. 
7. Thermonectes marmoratus. 
Colymbetes marmoratus, Hope, Anim. Kingd. 1832, p. 284, pl. 32. £1; Sharp, Trans. Roy. Dubl. 
Soc. n.s. 1. p. 683. 
Hydaticus flavo-maculatus, Chevy. Col. Mex. fase. 1. no. 26. 
Hydaticus marmoratus, Aubé, Spec. Gén. vi. p. 167. 
Hab. Mexico, Jalapa (Hoge), Parada (Boucard, coll. Sallé), Ventanas, 2000 feet 
(Fornt); GuatemaLa, San Gerdénimo (Champion); Honpuras (Sallé). 
This brightly-coloured species exhibits a considerable amount of variation in the size 
of the yellow marks of the wing-cases. 
8. Thermonectes margineguttatus. 
Acilius margineguttatus, Aubé, Spec. Gén. vi. p.149; Sharp, Trans. Roy. Dubl. Soc. n. s. ii. p. 683. 
Hab. Mexico, Orizaba, Puebla, Vera Cruz, Jalapa (Sa//é); GuaTEMALA, Paso Antonio, 
400 feet (Champion); Panama, David (Champion).—Sovutu America, from Colombia to 
Parana; ANTILLES. 
9. Thermonectes cinctatus. 
Acilius cinctatus, Aubé, Spec. Gén. vi. p. 151°. 
Hab. Mexico }. 
This was described by Aubé on a single individual, which I believe remains still unique. 
I doubt whether it will prove to be more than a variety of Acilius margineguttatus. 
10. Thermonectes basilaris. 
Dytiscus basilaris, Harris, New Eng. Farm. 1829, viii. p.2; Sharp, Trans. Roy. Dubl. Soe. n.s. ii. 
p. 684: 
Acilius incisus, Aubé, Spec. Gén. vi. p. 147°. 
Hab. Nortu America, California, Texas.—Mexico, Jalapa, Oaxaca, Las Vigas, Vera 
Cruz (Hége); Guatemata, Duefias (Champion).—BraziL!; ANTILLES. 
The species exhibits much variation in size, colour, and sexual sculpture in Central 
