236 



Scatopsc, Zygoncura, Zygomyia, Leptoccra, Lcstrcmia, and various 

 Cccidoniyiidcr. 



The genus is named in honor of Prof. S. A. Forbes, State 

 Entomologist of lUinois. 



DOLICHOPODID^ 

 Chrysotus Meigen 



The species belonging to this genus are usually brilliant metallic 

 green in color and of very small size, averaging about 2 mm. in length. 

 Little is known of their habits in the early stages. The adults may 

 be met with almost anywhere, during the summer months, running 

 on leaves of plants in the sunshine. They are, as far as I have 

 observed, purely flower- and plant- frequenting species, feeding on 

 nectar, honeydew on leaves, and on moisture. Some of the species 

 are met with near water, but often they occur at considerable 

 distances from any body of water. 



The species of Diaphorus are very closely allied to those of 

 Chrysotus, and in some cases it is merely a Cjuestion of individual 

 opinion to which genus a species belongs. It may be accepted as a 

 guide to the classification of the species of these genera that in 

 Chrysotus the legs are less elongated and the pulvilli not enlarged on 

 the fore tarsi. This is practically a summary of the differences that 

 exist between the genera, Diaphorus having the legs elongated and 

 the pulvilli of the fore tarsi at least, much enlarged. The males of 

 Diaphorus have also a group of four or more bristles on the apex of 

 the hypopygium, but these are sometimes weakly represented in spe- 

 cies which obviously belong to Chrysotus. The two genera are very 

 closely allied, and any revision of one of them would be necessarily 

 incomplete unless the other were treated jointly with it. 



Chrysotus ciliatus, n. sp. 



Male. — Metallic green. Frons with a slight violet-blue tinge; 

 face green, with a slight whitish pollinosity; palpi yellowish, proboscis 

 black ; postocular cilia white ; antennse black, arista concolorous. 

 Mesonotum on the posterior half with a slight violaceous tinge, the 

 anterior and lateral margins with slight white pollinosity ; pleurre with 

 slight violaceous tinge but not glossy ; scutellum bright green. Abdo- 

 men with distinct cupreous tinge on the dorsum. Legs yellow, coxae 

 except the apices, all the femora except the extreme bases and apices, 

 the entire hind tibiae and their tarsi, and the apices of the other tarsi 



