288 SUPPLEMENT. 



LOKDOTUS (p. 154). 



Lordotus gibbus (p. 154). 



There are a number of forms generally referred to L. gibbus in collections about 

 whose specific identity I do not feel sure. The following are the variations that the 

 specimens now before me present : — 



a. Costal and first basal cells of the wings yellowish ; first two joints of the antennae, and the femora wholly, 



yellow; mcsonotum with distinct tomentose stripes; abdomen opaque, with a median row of triangular 

 yellow-tomentose spots, the extreme tip white-pilose, with some blackish hairs on the fourth segment. — 

 Hab. Mexico, Tepetlapa, Chilpancingo, and Venta de Zopilote (H. H. Smith). Three specimens. 



b. Like a, but with the first joint of the antennae and the base of the femora black. — Hab. Mexico, near the 



city (Schumann). One specimen. 



c. Antenna? wholly black ; femora black, except the tip; mesonotal and abdominal stripes white-tomentose, 



the abdomen shining, with a complete black-pilose band before the tip. — Hab. United States, New 

 Mexico. One specimen. 



Neither Loew nor Jaennicke mention the tomentose stripes on the mesonotum. 

 L. pulcherrima, Will., has no stripes, the abdomen is uniformly yellow-pilose and 

 tomentose, and the first two joints of the antennae and the femora are yellow. There 

 can be no doubt of its distinctness from the foregoing, but I am not sure but that it 

 may be the real L. gibbus. 



L. zona, Coq., must closely resemble the form from New Mexico. 



PHTHIRIA (p. 155). 



Cyclorhynchus, Macquart, Dipt. Exot. ii. 1, p. 114 (1840). 

 Poecilognathus, Jaennicke, Abh. Senckenb. Ges. vi. p. 350 (1867). 



There is not a little variation in the neuration and in the structure of the head 

 among the species heretofore referred to this genus, which may afford grounds for 

 generic division. Acreotrichus, Macquart, has been accepted by both Schiner and 

 Coquillett, but the only tangible character that I can find for distinguishing it from 

 some of the species now located in Phthiria is the greater dilatation of the upper 

 part of the third antennal joint, and even this is not very marked. In the following 

 Table I include all the known Central-American forms. From the great dissimilarity 

 of the colour-markings in the two sexes, so common in this genus, it is usually very 

 difficult to associate them : — 



1. Deep black throughout ; hair of the head black, that of the face long 



(males) 2. 



More or less yellow or yellowish species (females) ....... 3. 



2. Hair of the thorax black. (Length 3-4 mill im.) ximilis, Coq. 



u . „ , , .. f dolorosa, sp. n. 



Hair oi the thorax yellow . < 



[.consors, O. S. 



3. Wings spotted, the tip strongly infuscate 4. 



Wings not spotted 5. 



