MONOGRAPHIA CHALCIDUM. 455 



The contents of the August number, are: — 1. Harpalns 

 riijiceps, an immature specimen of //. Hottentota of Sturm ; 

 to which species the H, jiifictiger oi Stephens is also referable. 

 2. Nonagria Vectis, one of the Noctuidce. A correspondent'" has 

 sent us Nonagria Typhce in all its stages. The larva is a most 

 singular one ; it is very elongate and slender, of a dirty brown 

 colour, longitudinally striped up the back and sides with 

 darker lines ;— it does not confine itself to an upright position, 

 as Duponchel observes, and Mr. Curtis repeats, but enters the 

 stem of the Tijpha, usually about eight inches above the water, 

 and continues to devour the central portion to the water's-edge ; 

 it then comes out, and attacks another and another. 3. Oryssus 

 coronatus. The description of this rare insect should have 

 been much more explicit, as its relation to Sirex, in a natural 

 arrangement, is a matter of great importance. Mr. Curtis has 

 dismissed the description of those segments which would 

 establish this, in the following words — " Thorax not larger 

 than the head." 5. Falagria thoracica, one of the Brache- 

 lijtra. 6. Adela Frischella. This is a bad plate ; too much 

 gilding and varnishing. 7. Mesochorus sericans, one of the 

 IchneumonklcB, and a beautifiul figure. 8. Pyrrhoceris 

 apterus, one of the Cimicida;. The description of this insect 

 is accompanied by some sensible observations on the probable 

 causes of the occasional swarming of peculiar species of 

 insects. 



Art. l^Wl.—MonograpJda Chalcidum. By Francis 

 Walker, Esq. F.L.S. 



( Continued from page 384.^ 



Genus X. Dicyclus,'' Walker. 



Caput thorace latins : antennae 13-articulatae, clavatse; articulus ^'^ 

 elongatus ; 2"^ elongato-cyathiformis ; 3"\ et 4"^ minimi ; 5"% 

 et sequentes ad 10"". fequales, breves ; clava elongata, articulis 

 9°. et 10". asqualis : mandibulae 4-dentat8e ; una arcuata, dentibus 

 acuminatis ; altera recta, dentibus fere obtusis : maxillae elongata^, 

 apicera versus interne in lobum productaj : palpi maxillares fili- 

 formes ; articulus 1"'. mediocris ; 2"'. paullo longior; 3"'. brevior; 



"^ A. , " 5k l)is, kvkKos circulus. 



