JOHN SAHLBERG, BIDRAG TILL NORDVESTRA SIBIRIENS INSEKTFAUNA. 
on 
bo 
304. Hydroporus tristis Parc. — AuBB Icon. V, 312, 539, t. 36, fi d. — Spec. gen. IHydroc. 615, 
101. — 'THoms. Sk. Col. II, 29, 33. — SCHAUM Ins. Deutschl. I, II, 157, 288. — GEemmM. et Har. Cat. Col. 441. 
— Dyticus PAyYK. FPauwn. Svec. I, 232, 44 (1708). 
In aqvis sphagnosis in territorio silvoso prope oppidum Tjumen ?3/5 (TRYBOM) et ad insulam Tschornaja 
ostrov 2/-! satis copiose lectus. — Europa borealis et media, Sibiria orientalis, America borealis. — Mus. Holm. 
et Helsingf. 
305. Hydroporus elongatulus STURM Deutschl. Ins. IX, 52, 27, t. 208, f. ce, C (1835). — THomMs. Sk. 
Col. II, 29, 34. — ScHAUM Ins. Deutschl. I, II, 68, 49. — Gemm. et Har. Cat. Col. 432. 
In territorio silvoso prope oppidum Jenisseisk ?9/; unicum specimen inveni. — Fennia, Svecia, Germania. 
- Coll. Sahlb. 
306. Hydroporus palustris L. — THoms. Sk. Col. II, 32, 38. — SCHAUM Ins. Deutschl. I, II, 72, 
J6. — Gemy. et Har. Cat. Col. 438. — Dytiscus L. Faun. Sv. 216, 773 (1761). — Hydroporus 6-pustulatus 
(FABR.) AUBB Icon. V, t. 32, f. 4—6. — Spec. gen. Hydroc. 969, 68. 
Habitat in aqvis stagnantibus in territorio silvoso et arctico freqveuter. — Europa tota. — Mus. Holm, 
et Helsing. 
307. Hydroporus vittula Er. Käf. d. Mark. 178, 24 (1837). — ScHauMm Ins. Deutschl. I, II, 72. 
Ja. — THOMsS. Sk. Col. X, 295, 38 bi — GEMM. et HAR. Cat. Col. 492. — H. ambiguus AuvBE Icon. V. 
2587, t. 33, f. 6. — Spec. gen. Col. 386, 60. 
In territorio silvoso, arctico et frigido satis freqventer occurrit; ad Samarovo, Jelisarovo, Imbatsk, Turu- 
chansk, Chantaika et Dudinka captus. — Europae maxima pars. — Mus. Holm. et Helsing. 
308. Hydroporus striola Gyrrn. — THoms. Sk. Col. II, 32, 39. — AuBE Spec. gen. Hydroc. 622, 
106. — GeEmMM. et Har. Cat. Col. 441. — Hyphydrus Gyuvr. Ins. Sv. IV, 393 (1827). 
In teritorio silvoso et arctico ad flumen Obi satis freqventer occurrit; ad Tobolsk, Spirina, Samarova, 
Jelisarovo et Narym captus. — Fennia, Svecia. — Mus. Holm. et Helsingf. 
309. Hydroporus angustatus STURM Deutschl. Ins. IX, 533, 28, t. 208, f. d, D (1835). — AuBE 
Icon. V, 314, 60, t. 36, f. 6. — Spec. gen. Hydroc. 617, 102. — THoms. Sk. Col, 32, 40. — SCHAUM JIns. 
Deutschl. I, II. 73, 97. — GEMmm. et Har. Cat. Col. 430. 
Habitat in territorio silvoso rarius; ad vicum Jelisarovo 3/4 (BERGROTH) et prope vicum Lebedevo ?7/a! 
captus. — Europa borealis et media. — Mus. Holm. et Helsingf- 
310. Hydroporus neglectus ScHaUuM Stett. Ent. Zeit. 1846, 409. — Ins. Deutschl. I, II, 70, 51. — 
"PHOMS. Sk. Col. X, 205, 33 be — GEMM. et HAR. Cat. Col, 437. 
In territorio silvoso prope oppidum Tobolsk ?/; unicum specimen invenit BErGrRotH. — Fennia, Svecia. 
(Germania. — Mus. Helsingf. 
311. Hydroporus obovatus n. sp. 
Oblongus, antice angustatus, postice dilatatus, convexus, niger, subopacus, subtilissime sat dense punctu- 
latus, tenuiter pubescens, antennarum basi pedibusqve rufo-ferrugineis, tibiis apice tarsisqve piceis; prothorace 
lateribus tenuiter marginatis, distincte arcuatis, angulis posticis obtusis, rotundatis. Long. 11/3 lin. 
Species inter H. atricipitem et umbrosum qvasi intermedia, ab omnibus statura postice dilatata, convexa, 
colore nigro angulisqve prothoracis obtusis distinguenda. — Caput magnum, omnium subtilissime alutaceum, 
vix visibiliter punctatum, nigrum; foveis frontalibus minus profundis; ore palpisqve obscure rufis, harum articulo 
ultimo piceo. Antennae prothoracis basin paullo superantes, crassiusculae, piceo-nigrae, articulis 4 basalibus 
totis, 3—7 basi rufo-ferrugineis; articulo 3:o et 4:o ceteris abrupte minoribus, 4:o subtransverso, 3—10 sensim 
paullo tenuioribus et longioribns, ultimo penultimo vix dimidio longiore. Prothorax elytris distincte angustior 
et longitudine paullo ultra duplo latior, apice qvam basi parum angustior, lateribus tenuiter marginatis satis 
fortiter rotundatis, angulis anticis rectiusculis, deflexis, posticis rotundatis; basi medio obtuse subrotundato- 
productus; supra modice convexus, niger, nitidus, limbo confertim punctatus, disco sublaevis, tenuissime pube- 
scens. Elytra protborace qvadruplo longiora, basi prothorace vix latiora et cum hujus lateribus angulum di- 
stinetum formantia, mox pone humeros usqve pone medium rotundato-dilatata, apice rotundata, convexa, satis 
dense subtilissime punctata et omnium obsoletissime alutacea, seriebus punetorum majorum nullis; tenuissime 
griseo-pubescens, nigrum, parum nitidum, epipleuris concoloribus, sublaevibus. Corpus subtus obsolete pun- 
ctatum, metasterno medio tenuiter sulcato. Pedes rufo-ferruginei, tibiis extrorsum tarsisqve piceis. 
In territorio arctico rarissime occurrit; prope vieum Chantaika !7/- duo specimina inveni. — Coll. Sahlb. 
312. Hydroporus umbrosus GyLnr. — AuBR Icon. V, t. 37, f. 2. — Spec. gen. Hydroc. 621, 105. 
—  THOMsS. Sk, Col. Il, 33 41. — SCHAUM Ins. Deutsehl. I, II, 70) 52. — GEmm. et HAR. Cat. Col. 441. 
— Hyphydrus Gyur. Ins. Sv. I, 3368, 23 (1808). 
