On the Constitution of the Body in the Blattida 1 ,. 227 



wards behind the ears. The fur of the body is short; the 

 tail is clothed with coarse short fur from which long- hairs 

 arise ; the feet are covered with short hairs of which the 

 longest are at the bases of the claws, which they nearly equal 

 in length. 



Both the upper and lower anterior incisors are remarkably 

 long (see Monograph of the Insectivora, pt.iii. fasc. i. pi. xxvii. 

 fig. 3), the upper anterior incisor has a short basal cusp 

 which does not extend even below the cingulum of the second 

 incisor. Viewed laterally the third incisor is very little 

 smaller than the anterior maxillary tooth ; but seen from be- 

 neath the latter much exceeds the former in cross section at 

 the base, and its cusp very slightly exceeds the anterior basal 

 cusp of the premolar ; its base is not emarginate posteriorly as 

 in C. titrauchii. The anterior lower incisor has a shallow 

 notch for the posterior basal cusp of the anterior upper 

 incisor. 



Length, head and body, 68 rnillim., tail 46, eye from tip 

 of nostril 14, length of ear 8|, elbow to end of middle digit 

 19, manus 8i, pes 14, tibia 14, distance of the tip of first 

 incisor from apex of principal cusp of the last premolar 5k. 



Type, preserved in alcohol, No. 1968, in the collection of 

 the Zoological Museum at St. Petersburg. 



XXXIV. — On the Constitution of the Body in the Blattida?. 

 By E. Haase *. 



Any extension of our knowledge of the structure of the 

 Cockroaches, however small, is of special interest, because two 

 characteristic representatives of this family of Orthoptera, the 

 House-cockroach (Phyllodromia germanica, Fab.) and the 

 Kitchen-cockroach (Perijilaneta orientalis, Linn.), from their 

 occurrence in the dwellings of man and their adaptation to 

 this protective habitat, are to be obtained in abundance 

 throughout the year, and further because, on account of their 

 considerable size, they have always served as a chosen material 

 for an introduction to the anatomy of insects. 



But, moreover, the oldest remains of fossil insects known 

 to us, the Silurian Paheoblattina Durvillei, Brongn. t, and 



* Translated from the ' Sitzungsberichte der Gesellschaft Naturfor- 

 schender Freunde zu Berlin,' Jahrg. 1889, pp. 128-136. 



t F. Brauer sees in the preserved remains of the wing indications of a 

 probably synthetic Orthopteron approaching the Mole-Cricket (Ann. k. 

 k. Naturhist. Hofin. Wien, i. 1881, p. 1). 



