Heterogyna and I<ossonal Hjimenoptera. 223 



much rounded and elevated, the ocelli very prominent ; 

 antennse with the scape very short, ahout as long as the 

 two following joints ; mesothorax irregularly punctured 

 and somewhat rugose hehind, converging lines very deep 

 and crenate ; metathorax crenate at the base, apex with 

 two short spines ; wings as in the description of the 

 genus ; abdomen shining and polished ; nodes of the 

 petiole UTegularly rugose ; legs finely pilose. Length 

 4 mill. 



? rather larger than the ^ , black-brown, with the 

 clypeus, mandibles, antennae, legs, and the under side 

 of the thorax and nodes of the petiole reddish tes- 

 taceous. Head rugose, somewhat clathrately so at the 

 sides ; scape of the antennas thick, and about as long as 

 the nine following joints of flagellum ; mesothorax 

 smooth in front, longitudinally rugose behind ; meta- 

 thorax with two horizontal spines ; abdomen shining, 

 finely pilose, nodes of the petiole rugose, basal node 

 nearly quadrangular; legs finely pilose. Length 4 mill. 



^ like the ? but smaller, and with thorax more rugose. 

 Length 3 mill. 



Hab. — Bare. Isle of Wight ; London district ; 

 Worthing. 



The following species have been admitted into our 

 lists, but they only occur in greenhouses, or other places 

 where there can be little or no doubt that they have been 

 introduced from abroad : — 



Tetramorium guinecnse, F.=^ Kollari, Sm. — Green- 

 houses, Exeter, &c. 



T. simillimum, Sm. — Kew, &c. 



Phcidolc ■mc(iacci)hala, Y. ^=^ laevigata, Sm. — Green- 

 houses, &c., Exeter, and house in the Borough. 



FOSSOKES. 



Of this tribe wc have thirty-six genera in England, 

 varying very much in structure and in the neuration of 

 the wings. They have all short tongues, and the $ has 

 no pollen-collecting apparatus ; the first joint of the 

 posterior tarsi also is not wider than the others, as it 

 is in nearly all the Melliferae. Still, there are cases 

 where it is not easy, at least for a beginner, to say 

 whether the insect before him belongs to the Fossores 



