PHILIP P. CALVERT 385 



denticulations, then three longer distinct teeth and lastly the still longer end 

 hook (thus, apparently, as in ^yalker's description). Mentum with about 

 four or five setae on its lateral margin just proximal to the articulation with the 

 lateral lobe. 



Femora with a very indistinct transverse, anteapical, brown ring, coloring 

 of tibiae very indistinct. Metathoracic wing-covers reaching to the middle 

 of the fourth abdominal segment. 



Setae on each side of dorsum of al^dorainal segments increasing in length 

 and in number from segment one (.06 mm., ai. 15) to segment three (.14 mm., 

 50+), thence decreasing on four and five (.1 mm., ca. 25); on six to nine a 

 group of shorter, stouter setae (.08 mm. long) at the hind end of the lateral 

 carina. Many other still shorter setae or spinules present on seven to ten, 

 but irregularly distributed, not forming rows, transverse or otherwise. No 

 distinct markings on the ventral sm^face. 



Median gill 3.5X1.0 mm., a transversely extended narrow spot of brown 

 pigment at shghtly less than mid-length, pigment elsewhere much paler and 

 indefinitely distributed; dorsal and ventral margins each with marginal setae 

 .04 mm. long, not overlapping each other, but separated by intervals as long 

 as the setae themselves, and which extend from the ba.se caudad almost as far 

 on the dorsal margin as the level of the brown spot, on the ventral edge for one- 

 third of the gill's length. 



Lateral gills 3.7X1.0 mm., colored similarly to the median gill, but the 

 narrow spot of brown pigment is at a Uttle more than one-half of the gill's 

 length; the marginal spines (.06±mm. long) are confined to the ventral edge, 

 reaching as far as the brown spot and overlapping each other, hence more 

 closely set than on the median gill. (Examined under a Zeiss comp. microsc, 

 oc. 3, obj. A). 



On color differences here indicated no great empha'^is must be laid, consider- 

 ing that much pigment disappears from the exuvia after moulting. 



EnaUagma pictum (Plate XXXIII, figs. 22, 23.) 



Enallagma jridumMor^e, Psyche, vii, 274, 307, 1895 (Sherborn, Massachusetts). 



cf. Superior appendages in profile view, with the apical margin two-thirds 

 as long as the inferior margin, slightly bilobed, lower lobe a httle larger than the 

 upper; in dorsal view, the intero-inferior lamella reacliing to the level of the 

 supero-internal subapical hook. 



Nasus orange, a transverse basal black stripe, trilobed distallj-, the three 

 lobes of varying prominence; or, black predominating, rather broadly mar- 

 gined with orange. 



Frons: jjale color of its anterior surface not attaining the median ocellus, a 

 mere yellow line bordering the ocellus anteriorly. 



Pale postocular spots linear-cuneiform or linear, orange, not confluent with 

 the pale color of the rear of the head. 



Middle prothoracic lobe in dorsal view black with metallic green reflections, 

 a small yellow or orange spot (in some absent) each side in the anterior 

 half, sides inferiorly yellow. 



TRANS. AM. ENT. SOC, XLV. 



