122 



I may add that in the type the second submarginal cell 

 is sometimes petiolated, and that the first submarginal 

 cell receives the first recurrent and the third the se- 

 cond. In the English species described beneath, these 

 nervures inosculate with the transverse ones which se- 

 parate the first fi-om the second and the third fi:om the fourth cells, and 

 in the British species also the antennae are inserted on the external 

 side of two small central facial processes. To exhibit the most stri- 

 king differences between this and the next genus, the woodcut to each 

 shows the anterior wing and the profile of the abdomen. 



1. Trig, melanoleuca, Westwood, 'Proceed. Zool. Soc' April 14, 



1835, No. 28, p. 53. Long. 4^ lin. Alar. Exp. 8| lin. 



Inhabits Brazil. In my own and the Brit. Mus. collections. 



2. Trig. Anglicana. Atra, nitida : thorace punctulato : alis hyalinis, 



fascia subapicali brunnea. Long. 4. lin. Alar. exp. 8 lin. 



Inhabits the west of England. There is a specimen in my own col- 

 lection. Entirely of a deep black, brilliantly glossy on the head and 

 abdomen. Antennae inserted on the external side of a couple of small 

 flat facial processes. Thorax densely punctulate, making it subopaque ; 

 metathorax rugose, with a central longitudinal carina and two lateral, 

 curving and divergent. Wings hyaline, with a dark cloud covering 

 the basal half of the marginal cell and the apical half of the first and 

 the entire second and third submarginal cells. 



This species, which is the first European rejDresentative of the 

 genus to which it belongs, and also the first recorded British speci- 

 men of the family to which I assign it, was taken either at Bristol or 

 Swansea, as I am informed by Mr. Thwaites, by the late Mr. Millard, 

 in whose collection it was purchased by Mr. Walton, who, with his 

 accustomed liberality, knowing the interest I take in the order, kindly 

 presented it to me. It may or may not have been i mported with plants 

 from America, but until the identical species be known as a native of 

 that continent, I cannot see any reason to doubt the possibility of this 

 being indigenous with us, particularly as the West of England abounds 

 in many extraordinary Hymenoptera. The antennae in this insect 

 are mutilated; on the longest side only fourteen joints are left, but 

 they hence even appear not to have that gradual inflation in the mid- 

 dle found in the type, and even more conspicuously in the next genus. 



