30 INSECTA MADERENSIA. 



21. Calathus complanatus. 

 C. apterus piceuSj prothorace subquadi-ato antice et posticc leviter angustato lateribus subreflexis vix 

 fernigineis, elytris ovatis profimde striatis, singulo piinctis tribus vel quatuor impresso, antennis 

 pedibusque ferrugineis. 

 Long. cor]), liu. 4J-5|. 



Vw. a. depressus piceus, in utroque sexu prsesertim foemineo subopacus, prothorace angustato. 



Long. 5-5i lin. {Madera; usque ad 4000' s. m. prsedominans.) 

 Var. /3. depressus nigro-piceus leviter angustatus, in utroque sexu prajsertim fcEminco subopacus, 



prothorace angustato. Long. 5-6 hn. {Deserta Grandis.) 

 Var. y. valde depressus piceus latiusculus brevis, mare parum nitido, fcemina valde opaca, prothorace 



latiusculo. Long. 4^5i hn. [Partus Sancttis.) 

 Var. 8. subconvexus piceus latus breviusculus, in utroque sexu prjesertim raasculo nitidus, pro- 

 thorace lato. Long. 4|— 5 hn. {Madera; a 4000' s. m. usque ad cacumina montium ascendens.) 

 Long. corj). hn. 4>-G. 



Calathis complanatus, (Kollar) Dej. Spec, dcs Col. iii. 73 (1828). 



Habitat insulas Maderenses, sub lapidibus trancisque arborum projectis, ubique vulgatissimus, ab ora 

 maritimS, usque ad cacumina montium ascendens. 



C. apterous, usually dark piccous ; the males slightly shining, the females more or less opake. Head 

 and protliorax less elongated than in the C. vividus ; the latter subquadrate, slightly narrowed 

 both before and behind, with the sides less reflexed than, and not so ferruginous as, in that 

 species ; longitudinally channelled in the centre, and with an impunctate fovea on either side at 

 the base. Elytra ovate, broadest about the uiiddle, deeply striated, and each with three or four 

 rather obscure impressions down the disk near the thu-d stria from the suture. Legs and antenna 

 much shorter than in the last species, and, with the paljii, generally dark ferruginous. 



Var. a., depressed, piccous; prothorax narrow; both sexes, especially the female, nearly opake. 

 {Madeira : the typical state below 4000 feet.) 



Var. /3. depressed, dark piccous, not quite so wide as the last, and the elytra rather more faintly 

 striated ; prothorax narrow ; both sexes, especially the female, nearly opake. [Dezerta Grande.) 



Var. 7. exceedingly depressed, piccous, generally broader in proportion and shorter than the other 

 varieties; prothorax rather wide, and a little convex anteriorly; the males very distinctly shining, 

 the females exceedingly opake. {Porto Santo.) 



Var 8. rather cou\ex, light piccous, broad and short ; prothorax wide, convex in front ; both sexes 

 shining, especially the male, which is often very bright. {Madeira : the usual state in the loftiest 

 altitudes.) 



The present insect is perhaps one of the most variable of all the Madcu-an 

 Colcoptcra, there being scarcely an altitude or a single rock which has not its own 

 modification of it, although the aberrations, it is true, are oftentimes but small. 

 Stni, since their outer limits are exceedingly far apart, they become, in the general 

 question concerning the influence of locality on insect form, extremely important, 

 and show but too clearly how great a number of so-caUed species might be erected 



