20 ENTOMOLOGICAL NEWS [xxxii, '21 



so difficult or impossible task for the collector. In collecting in 

 the tropics this difficulty is more rarely encountered. Seven 

 species of Argla all taken one day on one small stream were 

 all easily specifically recognizable before being netted. 



The appearance of Enallagmas at the Vanemon swamp this 

 year is their second appearance there since 1900. The first 

 appearance was in 1907, when on June 16 and 18, I took 77 

 males and 25 females of calvcrti and 3 males and 1 female of 

 cyathigcruiii. (ENT. NEWS, July '08.) In 1907 a single male 

 aspcrsimi was seen, and I think satisfactorily identified, but 

 not captured. This year a single male of ebriitm' \VSLS taken 

 at the swamp, associated with the other two Enallagmas, 

 cyathigcritm and calvcrti. 



Mr. Frank C. Waugh and I went to the swamp on June 13 

 to complete some observations and make comparisons with 

 conditions noticed a week earlier. The following remarks on 

 the Enallagmas are based on observations made during both 

 trips, June 6 and June 13. On June 6, 13 males of calvcrti 

 and only a single male of cyathigentin and a female of each 

 were taken. On June 13 the proportion was different, 32 

 males of cok'crti and 10 males of cyathigcntm, and a single 

 male of ebriuin being taken. The last is a new record for the 

 swamp. The Enallagmas were more numerous on June 13 

 and were flying generally over the entire swamp. They were 

 restless, seldom alighted, flew close to the water and were 

 therefore not easily netted. They were possibly more abund- 

 ant about the spatterdock leaves. There are at the present 

 time possibly half a dozen clumps, too small to be called areas, 

 of this plant in the swamp. On June 6 pairing and ovipositing 

 were going on more actively than on June 13, which was a 

 cooler and cloudier day. The pairs rested on the floating spat- 

 terdock leaves and so far as observed oviposition was invari- 

 ably in the upper surface of the leaf, no particular area of this 

 surface being preferred. The female, in couple with the male, 

 held her abdomen nearly vertical and gave a quick push to 

 insert a single egg. A single egg to several eggs might be 

 placed in a leaf, the pair generally moving restlessly from leaf 

 to leaf. The spot of insertion of the egg is soon marked by a 



