382 
DK. E. AV. SHUFELDT’S MOEPHOLOQ-ICAL 
with the relatively large intestine, with, too, its bulbous cloaca, I 
have represented in figure 34. 
Swifts possess a stomach, both in position and general form, 
very much like the SwalloAvs, and, as Ave now know, nothing 
at all like the Trochili. True, neither Cypseli nor Trochili pos- 
sess intestinal cceca ; but does this mean anything when no other 
two organs in the bodies of these birds have any resemblance to 
each other whatever, so far as affinity is concerned P Look at 
them in the figures ; are there many birds in the Class more 
widely separated in this respect than these Swifts and Humming- 
birds ? 
Upon laying open the stomach of a specimen of Micropus 
melanoleucus, I found it packed full of insects ; but, what is more 
important, anatomically speaking, I discovered it to be lined 
Avith a tough, corneous, inner coat, which was lifted out entire, 
by simply using very gentle traction, with a pair of dissectiug- 
forceps. The stomach of the Humming-bird Avas also full of the 
tiniest Coleoptera imaginable, which were veiy interesting to 
study under a two-inch objective attached to my Beck’s binocular 
microscope, and I wondered as 1 did so Avhether all these tiny 
Hew-Mexicau beetles were known to science. 
• Apart from the fact, then, that Cypseli and Trochili agree in 
certain numerical and negative characters (“ a single carotid, 
and no caeca,” dangerous facts sometimes !), these birds are by 
no means related, so far as the organs we have just been inves- 
tigating are concerned. 
Having now passed in review the characters of a Passerine 
bird ( Ampelis cecborum), and gone very carefully over the 
osteology of certain Trogons, and even yet more thoroughly 
over the structure of many Gaprimulgi, SwalloAvs, Swifts, and 
Humming-birds, I believe, as my views have been slowly for- 
mulating during my painstaking dissections, that I am uoav in 
a position to reconsider what I have already published upon 
the classification of the Mackochibes, as well as to present the 
conclusions at which I have uoav arrived, aided as I have been 
by all this recent research. Before doing this, however, I desire 
to present in a few paragraphs the results of my investigations 
upon tAvo specimens of T. Calliope, nestlings only a day or two 
old, and for Avhich I am indebted to the generosity of Mr. F. 
Stephens, of San Bernardino, California, Avho sent them to 
me to be used in the present connection. One of these little 
fellows I dreAv, life-size, and it will be found figured on PI. XXIII. 
