150 THE CANADIAN ENTOMOLOGIST. 



A NEW COCCID FROM NICARAGUA. 



BY T. D. A. COCKERELL AND \Y. \V. ROBBINS, BOULDER, COLO. 



The Coccidre of Nicaragua are practically unknown ; it is therefore 

 not at all surprising that a species collected there, kindly transmitted to us 

 by Prof. C. F. Baker, proves to be undescribed. 



Mesolecanium perditulum, n. sp. 



? . — Scale, 2^-2^ ram. long, 2J4 or a little less broad, about % to 

 24 nam. high ; subcircular, flatiish, very dark reddish brown, almost black, 

 moderately shiny, rough but not pitted, marginal plications few and 

 obscure. Immature and parasitised scales are often light ferruginous. 

 (The parasite is a Chalcidid.) Skin with scattered minute circular 

 glands; submarginal area with moderately large gland-pits; stigmatal 

 spines very short, not projecting beyond margin ; caudal slit evanescent 

 (the sides coalescing) in mature specimens. The measurements of the 

 antennae, legs, etc., are all in micromillimeters. Anal plates with the inner 

 side about 132, anterior outer side 117, posterior outer side 87, the lateral 

 corners obtusely rounded ; distance from tips of plates to hind end 460 to 

 545; digitules of tarsus slender, about 27 long; claw-digitules curved, 

 about 27 long, not very stout; claws ordinary. Middle leg with coxa 

 about 119, femur + trochanter 136, tibia 102, tarsus 59. Antennas 

 7-iointed, with joint 3 very long ; joints measuring (1) 45, (2) 33-37, (3) 

 102-105, (4) 20-25, (5) 25, (6) iS, 07) 30. 



Hab. — Quesahpiaque, Nicaragua, Jan., 1902, on bark of small 

 branches of tree No. 2122 ( C. F. Baker). The bark is very pale reddish. 



Closely related to M. perdition (Ckll.) from Yucatan, but smaller and 

 flatter, and differing in various minor details. 



A NEW GALL-GNAT ON ARTEMISIA. 



BY T. D. A. COCKERELL, UNIVERSITY OF COLORADO. 



A short time ago I received from Mr. E. Bethel a large number of 

 galls collected on Artemisia frigida in the vicinity of Denver, where he 

 tells me they are very common. During the last days of March the flies 

 emerged in quantities, and prove to belong to a new species. 



Rhopalomyia Betheliana, n. sp. 

 Galls about 3 mm. long and 2 broad, pyriform, with the large end 

 basal and the apex truncate ; pale ochreous, with some white tomentum. 

 They are deformed fruits. 



May, 1^09 



