124 Psyche [August 
described from America, three of which are represented in the 
national collection by single specimens. Four other specimens in 
the collection belong to two species hitherto undescribed and 
are now characterized. The European species, Trigonometopus 
frontalis Meigen, frequently has the last section of the fourth vein 
appendiculate; none of the specimens before me show this peculiar- 
ity. The American species may be separated as follows: 
1. Wings subhyaline, two round dots on outer section of third vein 
punctipennis Coq. 
Wings not so marked 4.0. uc. a tame otice fee ae ale bier eee 2 
2. Wing pale along the costa, a dark streak medially........................ 3 
Wingsinotsonmanked sameeren ner een errr Pee ee re 5 
Sh Ulloxo Haniel IMO AN NOs wesc oue cus oo dase aos oobobbusuodsS duc vittatus Loew 
Abdomen dorsally black, marked medially with yellow ................. 4 
4. Wings with a dark spot on the anterior cross-vein, median stripe of abdomen 
COPD: cee eS en Dee ee albifrons sp. nov. 
Wings without spot on anterior cross-vein, median stripe of abdomen abbre- 
Waited” & stensfoitiages potoeeetel hohe eC Te See UE ene angustipennis sp. NOV. 
5. Wings whitish hyaline, reticulated with fine bars of black between the veins 
reticulatus Johns. 
Wings not reticulate, a dark shade along costa involving second vein 
rotundicornis Will. 
Trigonometopus angustipennis sp. nov. 
Male: Frons pale brownish, moderately broad, narrowing very slightly ante- 
riorly, the part in front of the eyes not broadened; a dark patch clothed with dense 
black hairs laterally from eyes to antenne; occiput dark brown along posterior 
margins of eyes, a black streak from eyes along lower margin of cheek. Antennze 
ferruginous, the third joint compressed, in lateral view broad and rounded; arista 
long, pale at base, black beyond. Mesonotum and scutellum black, with three 
narrow, well-defined, longitudinal yellowish stripes, confluent on anterior margin, 
posteriorly continued over the scutellum. Pleurze ocher yellow. Abdomen 
dorsally black, a median yellowish stripe extending to the apex of the fourth seg- 
ment; sides and venter yellowish. Legs yellowish, the tarsi slightly infuscated. 
Wings rather narrow, the costal region to the middle of the submarginal cell pale 
yellowish, subhyaline, the involved veins pale; the rest of the wing smoky, a dis- 
tinctly darker median streak involving the third and fourth veins and near the tip 
of the wing extending forward to the costa and involving the tip of marginal cell; 
all the veins within the smoky zone black, a dark shade along the fifth vein and 
posterior cross-vein. Length: Body about 4.5 mm., wing 4 mm. 
Guadeloupe, West Indies, 3000 feet altitude, 30 July, 1905, one 
specimen (Aug. Busck). 
Type: Cat. No. 18482, U.S. Nat. Mus. 
