84 INSECTA MADERENSIA. 



surface most closely and minutely strigulose ; the males shining ; the females opake, and usually 

 of a somewhat more piccous hue. Head with the parts of the mouth, and two very obscure 

 transverse patches on the forehead dull feiTuginous. Prothoraw sparingly punctured along its 

 hinder margin towards the posterior angles. Elytra with three very irregular longitudinal rows 

 of impressed points on each. Legs and antenna more or less rufo-piceous, or rufo-ferruginous ; 

 the latter being the paler of the two ; and the former with the femora generally somewhat darker 

 than the tibise and tarsi. 



The A. hipustulatus, so abundant througliout the whole of Eiu'ope and the north 

 of Africa, occiu's in nearly all the streams and pools of Madeira, and at all alti- 

 tudes, — though perhaps it is more common above the elevation of 1000 feet than 

 below it. Being an insect of such wide geographical range, we should not expect 

 it to be much affected by either latitude or position ; and accordingly we find that 

 the Madeiran specimens do not in any respect differ from the usual type. 



66. Agabus nebulosus. 

 A. ovatus convexus nitidus uigro-piceus, capitis parte antica maculisque duabus in fronte sitis obscure 

 rufo-testaceis, prothorace rufo-testaceo in di.scum bimaculato, elytris testaceis, macidis plurimis 

 ininutis inajqualibus nigris plus minusve confluentibus undique iiToratis, singulo longitudinaliter 

 obsolctissime triseriato-punctidato, antennis pedibusque rufescenti-testaceis. 

 Var. /3. maculis frontalibus vel obsoletis vel confluentibus, prothorace immaculate. 

 Long. Corp. lin. 4-44. 



Bytisctis nebulosus, Forster, Nov. Spec. Ins. 56 (1771). 



bipunctatus, Fab. MaiU. Lw. 190 (1787). 



, Oliv. i:nf. iii. 40. 22 (179.5). 



Colymhetes nebulosus, Stopli. lU. Brit. Ent. ii. 72 (1829). 

 Agabus bipunctatus, Aube, Hydrocan. 328 (1838). 



Habitat Madcram, in aquis prope urbem Funchalensem a Dom. Ilousset nuper detectus. 



A. ovate, rather convex, beneath piceous-black ; both sexes shining. Head dark behind, its anterior 

 portion (commencing from about the insertion of the antenna;), and two obscure transverse 

 patches on the forehead, dull rufo-testaceous. Prothorax rufo-testaceous, rather mottled, or 

 clouded, in parts, and with two small darker patches on the centre of its disk ; most minutely 

 and sparingly punctured along its hinder margin towards the posterior angles. Elytra testaceous, 

 and more or less densely mottled, or clouded (especially behind), with small, U'regular, partially 

 confluent, black patches or spots, — which leave however a large, ill-defined blotch upon each, 

 behind the middle of the lateral margin, entirely pale ; with three longitudinal rows of most 

 minutely impressed pointsjust perceptible on each. Legs and antenna rut'o-testaceous. 

 Var. /3. with the frontal patches either obsolete or confluent j — in the latter case causing the head, 

 except the hinder and lateral margins, to be entirely ferruginous : and with the prothorax im- 

 maculate, the two small discal spots being absent. 



Apparently somewhat scarce, and confined, so far as I have been able to ascer- 

 tain, to the streams in the vicinity of Fuuchal, from whence I have lately received 



