HYDROPHILID&. 765 
HELOCHARES (p. 74). 
Helochares oculatus (p. 74). 
To the locality given, add :—Panama, near the city (Champion). 
Helochares seriatus (p. 76). 
Before the localities given, insert:—Mexico, Pinos Altos in Chihuahua (Buchan- 
Hepburn), Yautepec (Flohr). 
Helochares regularis (p. 76). 
To the locality Mexico, add :—Aguas calientes city (/ége). 
DERALLUS (p. 77). 
2. Derallus rudis. 
Lateraliter valde compressus, longitudinaliter convexus, niger, supra sneus, pedibus piceis, antennis, palpis 
tarsisque anterioribus fusco-testaceis ; elytris seriebus regularibus punctorum, internis basin versus desi- 
nentibus, interstitiis crebre punctatis. 
Long. 3 millim. 
Hab. Mexico, Vera Cruz (fdége). 
Antenne yellow, with the elongate club griseous; palpi sordid yellow, with the 
elongate terminal joint fuscous. Head closely, the thorax more sparingly, punctate. 
This insect is readily distinguished from D. altus by the series of punctures on the | 
wing-cases. Nine examples. 
BEROSUS (p. 78). 
Berosus salvini (p. 79). 
To the Mexican localities given, add:—Northern Sonora (Morrison), and delete 
Guanajuato, Puebla, and Toluca (Sallé): also delete the reference to Tab. III. fig. 1, as 
this represents B. hoplites. 
The examples from Northern Sonora (nine in number) differ but little from the 
Guatemalan representatives of the species, the small prominence on the penultimate 
ventral segment of the male being, however, not always present. 
Dr. Horn has recently recorded the occurrence of this species in Texas (Canad. Ent. 
xvii. p. 139). 
1 (a). Berosus hoplites. (B. salvini, Tab. III. fig. 1.) 
Major, supra testaceus, in elytris fusco-maculatus, capite zneo, prothorace dense fortiterque punctato, rugoso, 
opaco, in medio metallico-bivittato et utrinque maculato ; elytris striatis, rugoso-punctatis, opacis, apici- 
bus spinosis, angulo suturali acuminato; palpis maxillaribus flavis, apice nigro; corpore subtus nigro, 
prothoracis lateribus late testaceis ; pedibus rufo-testaceis, femoribus basi tibiisque apice nigris, tarsis 
variegatis ; metasterno medio posterius lamina erecta armato. 
Long. 8, lat. 4 millim, 
