TRIBE CIMBICINA. 3 



long, and projecting. The transverse median nervure 

 being either united to the transverse basal nervure, 

 or received quite close to it, is a well-marked pecu- 

 liarity of the family. So also is the structure of the 

 accessory nervure in the posterior wings. In no other 

 European sub-family does it run to the edge of the 

 wings without being united directly to the anal ner- 

 vure, nor with the other tribes is it united to the latter 

 by a cross nervure. 



The larvae are twenty-two-footed, cylindrical in 

 shape, usually greenish in colour, and dusted over 

 (especially when young) with a white exudation. Over 

 the spirales are situated orifices, from which are ejected, 

 often to some distance, a greenish, acid liquid, which 

 contains chlorophyll. 



They are, with one exception (Abia sericea), so far 

 as is known, attached to trees or bushes, and spin a 

 double cocoon, either to the branch of the tree on 

 which they fed, or in the earth. When they quit the 

 cocoon they do not eat away the one end entirely, but 

 leave it hanging by one side (see Yol. II, Plate XII, 

 fig. 5) as a lid. 



The tribe must be regarded as a Palaearctic and 

 Nearctic one, many of the species, indeed, penetrating 

 very far north (Siberia, Labrador, Hudson's Bay) ; 

 but, as already mentioned, two genera are found in 

 Brazil, and species of Cimbex, &c., occur in the West 

 Indies (Hayti), South America (Brazil, Argentine 

 Republic;, and in the Old World in Japan and North 

 India. 



This tribe contains the largest and most bulky 

 species of Tenthredinidde. As above defined, it con- 

 tains the Palsearctic and Nearctic genera Cimbex, 

 Trichiosoma, Praia, Clavellaria, Abia, Zar&a, and 

 Amasis, and the Neotropical genera Pachylosticta and 

 Plagiocera. The Australian genus Perga is included 

 in the sub-family by many authors ; but while Perga 

 has undoubtedly some affinity with the Cimbicina^ it 

 yet possesses sufficient distinguishing points to warrant 



