556, 

 BLATTA LAPPONICA. 



The Lapland Cockroach. 



Order Dictyoptera. Fam. Blattidas. 



Type of the Genus, Blatta Orientalis Linn. 

 Blatta Linn., Fab., &;c. 



Antenna: inserted in front of the face, close to the internal margin 

 of the eyes, long, setaceous and pubescent, composed of nume- 

 rous joints, basal joint stout subovate, 2nd and 3rd subquadrate, 

 larger than any of the following, which are ring-shaped towards 

 the base, becoming quadrate at the middle and oblong at the 

 apex, as represented at fig. 1 . 



Labrum exserted, suborbicular, but truncated at the base (2). 

 Mandibles short and stout, with 4 or 5 teeth at the apex, the 

 3 upper ones strong and acute, a membranous margin towards 

 the base on the inside, forming a little lobe above (3). 

 MaxillcB with an internal lobe acute at the apex, dilated and 

 ciliated internally, external lobe longer, fleshy, rounded and 

 naked. Palpi long, rough with short hairs, and 4-jointed, basal 

 joint subobconic, 3 following long of equal length, the 3rd cla- 

 vate, 4th sublanceolate and suddenly narrowed at the base (4). 

 Mentum short, convex at the base, notched on the sides. Lip 

 elongated, composed of 2 broad lateral rigid lobes, with 2 nar- 

 row ones at the centre and a fleshy hollow one behind. Palpi 

 attached to the sides near the base, pubescent, triarticulate, 

 basal joint short obovate, 2nd a little longer, 3rd the longest 

 clavate and truncated obliquely (5). 

 Head ovate, bent under the breast and concealed beneath the thorax : 

 eyes lateral and kidney-shaped : ocelli none ? Thorax semicircular, 

 the base convex : scutellum concealed. Elytra coriaceous, one lap- 

 ping over the other, ivith numerous nervures. Wings ample, folded 

 longitudinally, with numerous nervures. Females sometimes apte- 

 rous. Abdomen flat and oval, terminated by 2 jointed lobes and 2 

 slender appendages with a central curved one in the male (7 ^). Legs 

 rather long : coxae elongated and stout : thighs stout with a series 

 of spines beneath : tibiae clothed with very strong moveable spines ; 

 anterior the shortest, posterior the longest : tarsi 5 -jointed, basal 

 joint the longest, terminal one long and slender : claws curved and 

 acute (8). 



Lapponica Linn. — Curt. Guide, Gen. 445. 6. 



Ochreous, antennae, disc of thorax and abdomen, except at the 

 apex, piceous ; elytra with the oblique costal nervures dotted 

 with brown, the subcostal one having 4 or 5 small spots, the 

 space beneath brown thickly reticulated with ochre : wings iri- 

 descent, pale fuscous, a space on the costa and another below 

 it, towards the apex, darker : legs piceous, coxae and base of 

 tarsi ochreous. 



In the Author's and other Cabinets. 



As volumes might be filled with the histories of the different 

 species of Cockroaches, which are very numerous, and appear 

 to be distributed over every part of the earth, I can only make 



