408 ENTOMOLOGICAL NEWS. [Nov., I9II 



Cartage, but were supplied more often with Chironomid larvae ; 

 they did not seem as voracious as most Odonate larvae are. They 

 were numbered 54 to 61. No. 54 died Jan. 3, 1910. No. 55, 

 without further moulting, transformed April 6 as Mecistogaster 

 modestus $ . No. 56 died in attempted transformation April 

 II. No. 57 probably moulted Jan. 19-29 during our absence 

 and transformed April 18 as Mecistogaster modestus 9 . No. 58 

 moulted and died Jan. 19-29. No. 59 moulted Dec. 25 and 

 transformed April 4 as Mecistogaster modestus $ . No. 60 

 probably moulted Feb. 15-18 during our absence, as fragments 

 of an exuvia were found Feb. 19; moulted March 29-30 and 

 was found dead April 3. No. 61 moulted Jan. 7-16 and again 

 March 13-16 and was lost probably in the earthquake of ]\Iay 

 4. as we have no record for it later than March 16. 



The larvae of April 26, 1910, (Nos. 1-3) were at once pre- 

 served in alcohol, as were the pre-metamorphic exuviae and the 

 dead larvae resulting from our collections of Oct. 3-4 and Dec. 

 17, but not all the exuviae have been available for the present 

 study. 



Our diary for April 28, 1910, at Juan Vinas, records: "We 

 went down the road to the river [Reventazon] * * * At the 

 bromeliad cluster* from which we obtained the larvae on Decem- 

 ber 17 last, from which Mecistogaster modestus transformed in 

 our room at Cartago this present month of April, a single male 

 of this species was sitting on the tip of a leaf and was easily 

 caught with the net. Before reaching this tree we passed an- 

 other also with bromeliads of an apparently different species. 

 Around these bromeliads two females of M. modestus were 

 fluttering and alighting and altho' we did not see them making 

 any motions of oviposition, one of them disappeared into the 

 leaf bases as if she might be on such an errand. On the out- 

 side of one of the yard-long leaves, about six inches from the 

 apex, was an exuvia of modestus which we were able to get." 

 The diary for May i, 1910, reads : "Went down to the Revent- 



*In December we had pulled down some, but not all, of the stocks 



forming this cluster, leaving the others as a control. 



