THE 



aEOLOGICAL MAGAZINE 



NEW SERIES. DECADE III. VOL. IV. 



No. X.— OCTOBER, 1887. 



oiRXOii^r^^Xj -A.I^TIC!IJ:E]s. 



I. — On the Discovery op the Larval Stage of a Cockroach, 

 Etoblattina Peachit, H. Woodw., erobi the Coal-Measures 

 of Kilmatirs, Ayrshire. 



By Henry Woodward, LL.D., F.E.S., F.G.S., 

 British Museum (Natural History). 



(PLATE XII.) 



BY the kindness of Mr. B. N. Peach, F.R.S.E., F.G.S., of the 

 Geological Survey of Scotland, I have been permitted to examine 

 a very interesting insect-remain enclosed in a light-brown nodule 

 of Clay-Ironstone, obtained fram Kilraaurs, Ayrshire. 



In February last ^ I had the pleasure to describe three new forms 

 of British Carboniferous Cockroaches, viz. : — 



1. Etoblattina Johnsoni, H. "Woodw., Coal-Measiu'es, Coseley, near Dudley. 



2. Leptoblattina exilis, H. Woodw. do. do. 



3. Lithomylacris Eirkbyi, H. Woodw., U. Coal-Measures, Meithil, Fife. 



Mr. S. H. Scudder, of Boston, has described no fewer than 30 

 species from the Coal-Measures of N. America, whilst 41 species 

 have been described by Goldenberg, Heer, Germar, Scudder, and 

 others from the Coal-Measures of Europe, so that this group of 

 Orthopterous insects was perhaps almost as well represented in the 

 Coal-period as at the present day, and nearly as widely distributed 

 geographically. 



The present example from the Coal-Measures of Kilmaurs makes 

 us acquainted with another entirely new form, measuring 23 milli- 

 metres in length, by 14 mm. in breadth, and exhibiting the minute 

 head sunk in the rounded pronotum, a pair of rudimentary wing- 

 covers, and a pair of rudimentary wings, which, as in other fossil 

 cockroaches, are not differentiated from one another as they are 

 in the modern Blattari^e. 



The abdomen exhibits nine segments with broadly-expanded free- 

 edges to their terga remarkably unlike the abdomen of most modern 

 cockroaches. 



The 8th and 9th segments are as large in proportion as those 

 preceding them, thus differing markedly from living species, in which 

 the terga of these segments are very narrow and are greatly over- 

 lapped by the 7th segment. 



The 10th abdominal segment cannot be made out, but was probably 

 present between the free-edges of the terga of the 9th segment. 



Save the wings, no appendages are preserved. 



1 See Geol. Mag. 1887, Decade III. Yol. lY. pp. 49—58. 



DECADE III. — YOL. lY. — NO. X. 28 



