LIST OF 
PLATES. 
Plate. | Fig. Page. Plate Fig. Page. 
Harirrips. Gonetopus costatus .......... ai 3 ss 
: Sari cthebius crassipes .......... . 
Haliplus solitarius............ I. 1 2 Hydrena longicollis .......... IL. 5 a 
brevis .. 2... eee ee eee . 6 : 
i t Danser. I 4 | Cyclonotum grossulum ........ TIL. 7. 96 
CSOTOLCTUS TRVICONIS vs ee eee . 2 Pheenonotum tarsale .......... Ill, 8 98 
Canthydrus simplex .......... 7 : rotundulum ..........-. Il. 9 | 100,770 
—— mexicanus .........-.. . ae o po Il. | 10 100 
Bidessus hydrovatoides ........ I. 5 | 20,753 Pe oypus gocmant oo, Tl. | 11 102 
SETMAMNS eves eee ee es 1. 6 ~9 | Cercyon insignis............0: Il. | 12 105 
clongatus .............. I. ‘ 25 variegatuS ............-- Ill. | 138 | 107,771 
Agabus americanus .......... I. 8 33 | Pelosoma lafertei ............ Itt. | 14 109 
Copelatus terminalis... +. ++. | 9 39 | Nitidulodes jansoni .......... I. | 15 | 112,772 
impressicollis............ I. 10 | 40, 7 57 Oosternum costatum .......... II. 16 | 113,772 
Pants atricolor ciatus - t 1 42,7 Megasternum strigicolle ...... IV. 1 | 118,772 
s nigrofasci Lee . : Iv. 114 
Megadytes fallax ............ I. 13 47 Deltostethus sulcatus... 
Cybister fimbriolatus .......... I. 14 | 48, 759 Hareroceripm 
G Heterocerus debilis .......... IV. 3 116 
. YRINIDR armatus, ¢ .......0000- TV. 4 117 
Dineutes truncatus............ I. 15 49 , 
Gyretes leionotus ............ I. 16 | 51,761 p 
ARNIDZ. 
HypRopHILipz. pryors eimoides. bebe e eee eee ah ° mt 
Hydrophilus insularis ........ I | 1 54 | Disersus longipennis, ¢...... 17 
Tropisternus mexicanus........ II. 3 | 55,762 peaanchorus, gracilipes, 3 ae i 128, ‘ 59 
icipalpis...........0.. II. é 55 u POPS srr ’ ae 
heevicollia Wooo cece cece, Il. ‘ 56 Cyllcepus optatus ............ IV. 9 129 
ovalis.................. Il. 5 57 | Heterelmis obesus ............ IV. 10 131 
oculatus..............2. II. 6 59 | Hlsianus robustus ............ IV. 11 182 
Pleurhomus obscurus* ........ II. 7 | 60,763 | Elmis championi ees IV. 12 134 
Hydrocharis perfectus ........ II. 8 | 61, 764) heteroceros £.......-.+.. IV. 13 136 
Oocyclus brevicornis .......... II. 9 63 | apicalis .. 2+... 2... eee, IV. 14 136 
Philydrus mexicanus.......... I. | 67 | —— Nodipes .... 6... esse eee IV. | 16 138 
Hydrocombus politus.......... IL. 10 72.) — sulcicollis ....... 0.20... IV. 16 139 
Sindolus optatus.............. II. 12 72) 
Chasmogenus fragilis.......... II. 13 73 GEOoRISsIDa. 
Helochares championi ........ Il. 14 75 | Georissus minor .............. IV. 17 141 
Helopeltis larvalis ............ II. 15 77 
Derallus angustus ............ II. 16 73 CYATHOCERIDE. 
Berosus hoplitest ............ Il. 1 765 ; . 18 AA He 
Hemiosus maculatus ......... Til. | 2| 985,767 | Cyathocerus horni ............ Ty. { 18q-d| 144, 75 
* Tropisternus obscurus on the Plate. 
+ Berosus salvini on the Plate. 
+ Elmis heterocerus on the Plate. 
2 
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