64 CYKTIDAE OF NORTH AMERICA 



This is a hard species to place with certainty and the type 

 would have to be studied to make sure. 



I have seen specimens answering this description from several 

 localities, mostly in the New England States; two specimens were 

 taken in Toronto and Manitoba. A specimen in the National 

 Museum, collected by A. A. Girault at Coulterville, Illinois, has a 

 label, "Bred from cell of Sceliphron cementarius. Iss. June 18, 

 1911." 



Ogcodes costatus (PL XIV, fig. 40.) 

 Oncodes costatus Loew, Centuries, ix, p. 202. 



"Black, posterior margins of abdominal segments whitish, costa and veins of 

 wing fuscous, apical half of costa incrassate. Length, 2h lines. Wing, 2 ^/'i2 

 lines. 



"Shining, of pitch black color, prothoracic stigmata margined black, tarsi, 

 however, toward apex black, pulvilli and empodia concolorous. Abdominal 

 segments with posterior white fasciae, narrow and evenly marked. First 

 ventral segment black, with posterior white fascia, quite narrow but dilated 

 toward sides. Tegulae dirty whitish, margined fuscous. Wings subhyaline 

 showing toward base a vestige of subfuscous color; costa and veins deep 

 fuscous; apical half of it incrassate, half of posterior cross-vein obsolete." 



Habitat. — Massachusetts (Sanborn) . 



I have seen a number of specimens of this species from various 

 localities and all were males. Perhaps the female is known as 

 another species. The four species: melampus, eugonatus, pallidi- 

 pennis and costatus all seem to merge. C. W. Johnson sent a 

 specimen of costatus, or what seemed to be that species, which 

 had a black scutellum. It is impossible to place immature speci- 

 mens of this group. Specimens of what I would term palhdipen- 

 nis are on the average smaller than the other three species men- 

 tioned above, but size is a very unreliable character in any 

 parasitic form, especially if there is at most a difference of only two 

 or three millimeters. I have seen no specimen of costatus from 

 localities west of Michigan. Malloch gives several localities in 

 Illinois (97), a large series taken on dead twigs of elm. There 

 was considerable color variation in these. 



Ogcodes humeralis 



Oncodes luunerulis (). S., Biologia Centr.-Amer. Dipt, i, j). 1G4, (1SS7). 



"Humeral and prescutellar balJosities and also pleurae brownish-yellow; legs 

 yellowish-brown, tips of tarsi darker; wings subhyaline. 



"Hab. — N. Sonora, Mexico. 



"Face, vertical triangle, occiput and antennae black; thorax the usual 

 brownish black, metallescent color, with dense, short, yellowish pubescence. 



